I don't care to remember them, but I do want them to be consistent so there's no dependency in DNS.
My home network isn't the Internet and isn't large: DNS is a much more complicated system to keep running then just fixed IP addresses in that circumstance.
Above a certain scale, that flips but not at the home level.
A router which can be switched off sometimes, or break and delay replacement.
I don't want all my IoT devices going down because they can't resolve hostnames - that's why I set fixed IP addresses for them. It means how they communicate with each other and my network is well-defined, and works provided they have Layer 2 (easy to keep up - it works provided any 1 AP is online, whereas my internet or the router providing it can vanish).
My home network isn't the Internet and isn't large: DNS is a much more complicated system to keep running then just fixed IP addresses in that circumstance.
Above a certain scale, that flips but not at the home level.