On the contrary, butted mail is easy to repair and easy to adjust once you invest in a pair of pliers and get the hang of which way the links run. I’ve used butted for years and it’s been adjusted to fit my shape like a glove and a little while each night just checking it for loose links and keeping it in good repair is all that’s needed.
Riveted is much harder to adjust, my riveted mail is nowhere near as good a fit, however I will not dispute that it needs far less repairs so I do get to skip the checking it over.
I’ve never used welded so I can’t comment on that.
The steel quality will effect the mail too, a bad mild steel will not make good mail, no matter what type it is. If possible buy from English sellers, I’ve had far less problems that way.
Both of mine are plain blackened steel, a good clean, dry and then spray with WD-40 keeps it rust free between events.