hello,

as always: imho (!)

idk:

as a business, if the "main focus" of your business is related to email =?> self-host.

but if this not your core business: why in the world would you even think about self-hosting!?

pay someone "as a service" / for your "peace of mind" and be done with that.

as a private person:

if you are interested in learning a lot about the internet and especially e-mail: do self-host ;)

if not: pay someone a few bucks a month and do stuff that matters to you ;)

just my 0.02€