I made the jump to 1*9 a few months ago and no regrets yet, but I think today could be the first real test on a long wet and muddy ride. I like the simplicity, slight weight reduction, and don’t miss gears I’ve lost. (It isn’t that hilly where I mostly ride)
I just fitted a narrow/wide chain ring and made (bodged) a top guide. The rear mech doesn’t have a clutch, has a long cage, but I’ve not lost a chain yet.
I do have another bike with 3*9 too.