Agree with everything you wrote pretty much. I just don't think they should actively construct more companions that will only bring some barks and a line or two of dialogue to the mix. If that's what you're interested in, create a mercenary

Larian's Biggest Oversight, what to do about it, and My personal review of BG3 EA
"74.85% of you stood with the Tieflings, and 25.15% of you sided with Minthara. Good outweighs evil, it seems."