How about a Secretive 'Startup' team to work on providing improvements and stability on iOS, iPadOS, watchOS, and macOS? It's the software that needs love and attention.
I feel like we have this discussion here, and on other platforms whether its Android, Windows, etc. Has overall OS gotten less stable? It's hard to say.
I challenge everyone by asking how often have oyu setup a BRAND new device, meaning not restored from backup but let all your iMessages download from cloud, only setup bare minimum apps, and install apps as you need? I do this whenever I can when getting a new device but I do recognize sometimes I simply want to copy and go.
With that said, I think it should be noted that a brand new device is extremely stable, has great battery life, etc. IF you're using a system backup where you have gone through 10 device upgrades, copying the same data over and over again it wouldn't be surprising that a backup copy of some app that you first setup on an iPhone 5 is in full working condition in 2023. So maybe Angry Birds crashes today because that backup has gone through 10+ devices and 10+ iOS revisions. Does that mean if you setup a brand new iPhone and download Angry Birds that it will start crashing also? I doubt it.
At some point device settings, many of which that you set ages ago may be outdated or some apps are so old they haven't been updated or settings are outdated for today's iOS / MacOS. I think this is even more prevalent in the Mac space where people download apps that are not on the App Store. Some apps have been long abandoned or use old hacks / APIs to do nifty new things. That same app that worked for some High Sierra hack in 2017 isn't necessarily going to work in Ventura. This is why when you look at popular apps that users have loved for years (BTT, iStat Menus, Alfred, etc.) they get major updates with new OSes. They get major updates with new hardware like M1 or M2 chips. No one forces these apps to be compatible too so at any point the developers can stop supporting them or stop updating them. The more hacky productivity tools you have, the more risky they are to breaking the whole system.
Also I touched on this in another thread, but recent version bias is a real thing. People think iOS16 or MacOS 13 is the worst thing ever, but come iOS17 and MacOS14, and now 16 and 13 are the most stable versions ever. IF every new version is truly worse then we shoud've gone from rock solid 99.999999% stability to instant boot crashes now but that's not the case. In my Android development days of nightly build bots, I would remember how so many people would come to report bugs about the newest nightly even if no commits have been made or the only thing that changed was translations. People would make wild accusations about reception, battery life, etc. when its more likely a simple reboot changed hwo their phone was behaving.
I suspect the reality is iOS or MacOS today is more or less as stable as the last few versions for most people.