Thanks for the reply, what’s the downside of not upgrading the OS X to latest version then?
After
@maflynn let's talk about the risks of upgrading: having your peripherals unsupported anymore. Just as an example, you can use Yosemite with almost no hassles these days. I think Mojave will be good until 2021 or even later. My wife had Yosemite on her Macbook Air until recently, without
needing to upgrade.
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Thanks, final push back. What about apps? Will those stop updating I’d immagine?
The most common compatibility issue is with drivers. App compatibility usually lasts longer than a couple of macOS versions. Safari get unsupported after two versions, but Safari cannot be taken seriously. I use mainly Opera and Chrome (it uses much more resources, but sometimes I need using it). Also, Apple's office suite (Pages, Numbers, etc) usually presents some issues, e.g., I had Mavericks and Pages always opened with the message "there is a newer version of Pages, do you want to update?", then I went to AppStore to update and a message was shown "your operating system doesn't support the most recently version of Pages", so I was in a deadlock.
In short: third party apps are usually supported by up to four previous macOS versions, i.e., you can install Chrome on Yosemite (macOS 10.10, 2014), but not on Mavericks (10.9, 2013) anymore.