:D all team told him to make underwater moho :D he said "not necessary" until it exploded to 2 scythes. At least he didn't even make def near it or wall :D

People seem to forget that quake exists. Burying it is now optional due to the counterplay quake provides. It costs 600m (roughly) to bury a geo to -110 iirc, this is the minimum height for full damage reduction against eos. The only effective wall against silo is raised HLT about 1-2 build spaces to the left/right of geo, but even then that's dubious and only helps once.

When burying it after the quake changes, one should not invest more than 400m into burying it less quake become cost effective on top of a geo snipe.

It is. It will unlocked your geo followed by a tacnuke snipe.