I had that same thought about staying current before making my decision and did a little research a while ago.  Most of the files we receive as a company don't need the latest version.  In fact, I could have been using 2013 for almost all of our business.

That being said, I have liked some of the updates Autocad has done.  Like pdf to line art import in 2018.

I also haven't really used any of their newer features (unless I'm missing something) since 2013 also.

That all might change when 2022 hits and a new file version is made with no free-ware to save to a previous version.  Then I'll have to pay for a way to accomplish this task.

Or I might be ok for 5 years, who knows   Adobe knows