[kackerlacker]

I think such situations are rather big risk that a community that already wasn't very active atrophies or splits and then atrophies. With code bases like that there's also a lot of maintenance so being able to run an old version is not necessarily enough.

[eudamoniac]

What maintenance are you talking about? I'm quite sure I could open any document on my computer with a libreoffice version from ten years ago. The functionality doesn't magically rot away...

[greekrich92]

Security vulnerabilities for one obvious example

[jrumbut]

Yeah that ability to use old code is great as an emergency escape hatch but it's not really a viable day-to-day document editing strategy.