Sooner or later you will have to update your UEFI cause there will no 2 versions of it, 1 for SB and 2nd for IB, updates are made to eliminate bugs resolve some conflicts so I don't underastand these tech support "specialists". I would translate it to "we don't want to have problems with you so do not update" but when all is ok then it's really not need to break it. I have no more problems with these new UEFI, initial MBR problem could correlated with something elese and user's fault but it's solved already. I want to have a new options so I will update it when new final UEFI appear, but betas are always risky.