There will never be a "one butt" kitchen or a wet/sink fixed island with our names on the title. Nor will there ever be a kitchen that can't be fully used with all the slides in owned by us. That certainly means full access to the frig too! There are many quality RV units offered that do not have these dumb issues and most are rear kitchens or with a kitchen slideout that has the sink in the base trailer area. A moveable small enough dry island that isn't in the way when the slides are out could be a possibility and there are some models with that feature.
You have to go into an RV model with all the slides all the way in to see what it's really like because floor plans in brochures are very deceiving and many not to scale. So many have been fooled!
With the slides in: Can you fully use the kitchen, bathroom, and access the bed and/or the closets on the other side of the bed. What a PIA to have to open a slide everytime for just a nature call on the road or to get a sweater/jacket etc if the weather changes, spill something, or maybe it gets a lot hotter in the afternoon and you want some different duds to wear. After just over 50 years of RVing now, we've been well educated and know what works and what creates problems!
We've been in so many "friends" one butt kitchen RV's in CG's etc that people have and very few like them after the newness wears off. A royal PIA is what some owners have called them! One thing we have always noticed with island sinks is that water spills or splashes or unseen food stills leave spots all over the floor and often it would be soapy water or have cooking grease in the spots from washing the dishes etc. Not only does it get tracked on to the carpet areas but do you know what grease residue or water on smooth wood or vinyl floors is like when you walk on it? Ice skating inside the RV is not very smart! To make it worse, kids or visiting kids/grandkids spill things and guess where that spill will usually be?
It's a "no brainer"