I too am appreciating this conversation, as I have quietly had the same question...
I cook almost daily, from scratch, in a pot. It takes me 20-30 minutes to make a complete, fancy, tasty meal. But, I believe people when they say their additional appliance (slow cooker, InstantPot, etc) rocks!
I found (!) a beautiful, brand new slow cooker a few weeks ago, so started playing with it. I was mortified to find I couldn't saute/carmelize my onions in my first six-minute step for most meals. So, back to the pot for that potluck dish. There, folks told me it's hours in the crockpot to get the same effect. Oy.
My next go was "perpetual bone broth." The first few days it felt fun to come home on crazy cold days to nice hot broth. But my plan was to eat it down over a week, then start a new batch, so I stopped adding water to it. Day 5 I had a thick, bitter product.
I'll probably try a few more experiments, but I agree it's all about individual systems/lifestyles/preferences, and for me, a 20-minute cook in one pot when I get home seems to be optimal.