Highly pragmatic approach you've got there... ;^)
I've been using a combination of Compressor (dozens of custom presets) for maybe 60%, and the other 40% and oddball stuff is done with ffmpeg, using FF•Works for the GUI.
I'd only use Squeeze when I needed webm, wmv, mpeg1, or some other thing that Compressor couldn't do easily. Mostly because Squeeze was stupid-slow on my cheesegrater MacPro, and Compressor does a nice job with MP4, MPEG2, HEVC, etc. Plus, I can set up Sharing outputs in FCPX using my custom presets. Real time saver in my case.
FF•Works was inexpensive, ffmpeg is free, and it covers all kinds of things I never knew I needed. There's a bit of a learning curve, but it is worth the effort.