After reading the xc thread I’m curious about why tubs are still used rather than tubeless, is it just a weight thing ?

They have a fantastic ride feel and are very adaptable. You can also ride them flat.

Mine a bugger to set up, a massive pain if they puncture, but they feel like riding a magic carpet, grip brilliantly and feel very fast rolling.

I only use them for racing though!

After reading the xc thread I’m curious about why tubs are still used rather than tubeless, is it just a weight thing ?

Not used by many at all. Yes they ride well and are very light but also puncture prone as are fragile and very expensive with a large hassle factor.