You're right that the Venn diagram is smaller than it was 5 years ago, but there are still some folks whose primary concern is electricity usage. Even the pi 5 shines there (as long as you don't need too much compute).
And then you get all the advantages of the x86 ecosystem, more modularity, etc.
Heck, I wouldn’t be surprised if the base model M series Mac mini is competitive so long as you can get Asahi Linux to do what you need.
Maybe five years from now we will see ARM or RISC-V mini PCs further narrow the Venn diagram for raspberry pi systems.