This....granted its easier to replace a truck now that its not timer based..but come on how would you feel if a single strike(or a single strike plus a few more small hits) could kill one of your tech structure? Which is what would happen if the HP is lowered.
I'm in favour of the status quo for building health. Arty counters them nicely - if used in conjunction with some armour and infantry, hell even mortars.
However we must remember, the game is player differently at top 150 top 500 and 1000+. as a player who can still get placed in those tier 750 for my pleb faction I can say that a lot of the lower tier players struggle to deal with a bunker until tanks come out...
I think alot of the 1000+ don't build a solid combined arms army (like they spam arty or armour) and wonder how a building backed up by defenders can be so hard to dislodge. I can see why lower tier players could think them OP. Especially if you are only running Sherman's or /34's at em. This can lead to frustration and calls of plz nerf.