I think pound for pound the ss tyzack 13inch trowel is a great bit of kit. I got one out of bnq.years ago used it for messing about .bonding ECT. Then cleaned it up one day it was a great finish trowel till I dropped it and broke the handle . Only 28quid. Good for newbie or diyer.
Timber moves. The same as plasterboard over joists and scim doesn't matter how much scrim or mesh u use timber expands ect. And u get a crack it's movement. It happens.same as solid walls any movement and render cracks above windows and doors mesh or eml won't spot it .