Sorry for a late reply, I am generally using ARM based images and I have run into VERY few things that availability was a problem for. I’ve never seen anything based on Debian or Alpine not have ARM variants. The only base image I’ve really ever run into problems with was Cent, and I only had like one thing that used it which I switched over to Debian and it’s not caused any problem for me.

I can definitely see mileage varying depending on the specific things you need to run, but I wasn’t ever really concerned with it because I usually have enough control over the images I use that I can switch something to a different base if need be.