I heartily agree. Countless bugs increasing at an accelerated rate with every new update, and the amazing features we loved and used as old timers are being removed in every major update. With more and more buggier SDK updates they are preventing 3rd party app developers to design great apps, too.
Below is a non-comprehensive list of features that I miss the most, that were removed from newer Macs and/or macOS versions:
Scheduled Startup and Shutdown
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Removed in: macOS Ventura (13)
• The Energy Saver preferences previously allowed users to schedule automatic startup, shutdown, sleep, or wake times. This feature was removed, and users now need to use Terminal commands or third-party applications to achieve similar functionality.
Built-in RSS Reader in Safari
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Removed in: Safari 6 (OS X Mountain Lion, 10.8)
• Safari’s built-in RSS reader allowed users to subscribe to and read RSS feeds directly within the browser.
Mail Stationery Templates
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Removed in: OS X Yosemite (10.10)
• Mail offered a variety of stationery templates for creating visually rich emails.
iWeb
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Discontinued with: OS X Lion (10.7)
• iWeb was a web design tool that allowed users to create websites and publish them via MobileMe. It was discontinued along with MobileMe, and users had to migrate to other web design platforms.
Front Row
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Removed in: Mac OS X Lion (10.7)
• Front Row provided a media center interface for accessing music, videos, and photos. Its removal pushed users towards using other media applications. But they are not long-lived because of a random incompatibility with yet another useless feature Apple macOS dev team silently pushed in sooner or later. (Also removed compatibility with its own remote controls)
iTunes:
Removed in: macOS Catalina (10.15)
iTunes was discontinued and split into separate apps: Music, Podcasts, and TV, to streamline media management. As
@silverdollar adequately put, neither of the new apps have any better usability than the original iTunes. I especially struggle with accessing my audiobook library with the new Books app, whereas iTunes was not only an excellent usable media player, but also a superb and efficient database manager of your media library.
Web Sharing (Apache) in System Preferences
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Removed in: OS X Mountain Lion (10.8)
• The Web Sharing option in System Preferences, which allowed users to enable the built-in Apache web server easily, was removed. Users now have to start Apache via Terminal commands.
Built-in PHP Interpreter
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PHP removed in: macOS Monterey (12)
Software RAID Management in Disk Utility
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Removed in: OS X El Capitan (10.11)
• The graphical interface for creating and managing software RAID arrays was removed from Disk Utility. Users must now use command-line tools like diskutil for RAID configurations.
Ink (Inkwell) Handwriting Recognition
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Removed in: macOS Catalina (10.15)
• Ink allowed users with graphics tablets to input handwritten text. This feature was removed without a direct replacement, affecting users who relied on handwriting recognition.
X11
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Removed from default install in: OS X Mountain Lion (10.8)
• X11 provided support for Unix-based graphical applications. It is no longer included and 3rd party alternatives need to be used, that is, until they crash your system because of a random incompatibility with yet another useless feature Apple macOS dev team will silently push in sooner or later.
Telnet and FTP Command-Line Clients
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Removed in: macOS High Sierra (10.13)
• The built-in command-line Telnet and FTP clients were removed
Disk Utility’s Repair Feature
• The option to repair disk in Disk Utility no longer works (pretends to work but does not fix fixable problems because of poor permission management) and advanced users need to resort to fsck_apfs command
AFP(s) File Sharing Protocol
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Deprecated in: macOS Mavericks (10.9)
• Apple moved to SMB2 as the default file-sharing protocol, phasing out AFP and affecting compatibility with older systems and devices.
Third party software alternatives are either not as usable, or simply short-lived as their developers get fed up with trying to keep up with Apple engineer's inconsistent and unstable SDK updates - not to mention the cash-cow treatments you will receive from some of them.