I don't get why they would pick a side in this. Just have both available and go on about your day.

I personally dont run knots but to each there own, as long as they understand what they are doing. Multiple node implementation's does provide optionality, even if not properly maintained. Other chains have multiple client and bode software which provides further decentralization.

I switched to Knots a while ago but other apps have to prioritize Knots way before Start9 will make it the default

You’re on the wrong side of this. Get used to it.