I would have disagreed with you when Pis were like $50 and chaining 3 Pis together with a hard drive was a fun project to do self hosting.
Now to get to the beefiest raspberry pi, it’s $120. And in the range, yeah, for price and reliability, use a mini-pc/laptop.
Addy user here! Been using it for years now and just last week, I saw an uptick in one of my aliases. Turned it off with a single toggle and no more spam.
The ability to self-host is awesome if I ever get to that stage. But right now, I want to keep giving them money.