Been 29er for about 3.5 years now. I’ve been through a succession of increasingly tougher, wider rims, culminating, (at the moment) in LB 30mm internal width times and 2.4 tyres.
It’s been a pretty quick shift, since it’s been pretty obvious that arch size alu rims can’t hack my chosen riding style, and I’ve butchered my way through a few rims.
It’s rims for me, rather than the build of the wheel, the number of flat spots, rim dings and punch flats was getting silly, but I was losing the benefits of low pressure tyres if I cranked up the tyre pressures to add some protection.
So, I’ve ended of with wide rims, big tyres, and low pressures in tough tyres.
TBH, it’s taken me a long time to stop comparing the weight of 29er wheel components to 26ers, but this year I’ve managed to realise it’s not really relevant.