Here is my rule for small kitchen appliances: I limit myself to what can be stored out of sight. I cannot stand appliances on my counters. The only appliance I have out is our Keurig.
I have and use frequently:
Instant pot
Basket-type air fryer
Vitamix blender
Electric skillet (I use this when I brown larger quantities of ground beef/turkey or for stir-frying veggies)
I have and use sometimes:
Crockpot
George Foreman Grill
Smallish Cuisinart food processor
Cheap hand-held mixer (I do not bake much at all)
Immersion blender
I have but use rarely and should probably reconsider whether I should own:
Anova sous vide
Food saver (which I got for the sous vide)
Waffle maker that makes one large, Belgian waffle at a time (but, I mean, you can’t make a homemade waffle without one of these - it’s not like there is a substitute)
I do NOT own a toaster, kitchen aid stand mixer, bread machine, espresso machine, or electric tea kettle (though I have had all of these appliances in the past).
We are not in a large space but I do have pretty good cabinet space. However, keeping all these appliances stored in cabinets means I don’t have a lot of room for things for entertaining - platters, serving type things, multiple types of dishes, lots of bar ware, table decor, linens. We live more casually now and no longer do large-scale entertaining, so it’s a trade-off for me to use the cabinet space for appliances.
I love my Instant Pot! Great for ribs, hard-boiled eggs, one pot pasta, risotto, cheesecakes, pork tenderloin. I have not used the air fryer as much as I thought I would, but I particularly like it for fish and shrimp and use it a couple of times a week. I use the Vitamix for smoothies.
I have just never gotten into the sous vide. I don’t understand how it is particularly useful if everyone likes their steaks cooked to different levels of doneness. I have not had great luck learning how to sear well. I have never tried chicken in it. Just steak and shrimp. I felt the shrimp had a weird texture coming out of it. Really sort of did with the beef as well. I should ditch it.