If you only look at today's numbers, it doesn't make a ton of sense. But looking at the market, the world is moving -more- towards ARM, not away. The last couple years have given us ARM in a gaming console, ARM in mainstream laptops, ARM in the datacenter. Especially as the world strives to go 'carbon neutral', ARM kills everything from Intel/AMD. So with that in mind, I don't think it's a bad buy, but time will tell.

RISC-V and ARM can coexist, but RISC-V in the mainstream is a far away due to nothing more than momentum. People won't even touch Intel in a mobile device anymore, not just because of power usage, but software compatibility.