Been using JetBoils since just before they got popular. They are brilliant for what you’ve outlined IE brew and ration packs. For anything more you really need a simmer ring. It’s not impossible to cook properly on them - it’s just faffy and burny.
However, I’ve also trialled the Alpkit Brukit and Highlander versions (which are about £35 rather than the cheapest JetBoil at £65ish now!). I prefer the Brukit over the Highlander and JetBoil - it’s slightly wider making cleaning inside easier.
The downside? None of these stoves are “windproof” as such. They are all more effective with a windscreen around them. MSR do one called the Windburner - it’s £100+ for similar results in standard conditions - but excels against them when the wind gets up. I’ve not even dabbled with it as I’ve not got cash to burn, nor the inclination to trial it for marginal gain in the conditions i work in.
I use my alpkit one pretty regularly on a range of stuff and it’s been great at knocking at brews in a jiffy. I’ve also been using it to trial freezer bag cooking with great success- anything to avoid a mucky pan!