Hardly from all buildings, but mortar and sniper flares are indeed nothing to be ignored.
T1 sniper/flares
T2 Mortar flares, ATG "tracking"
T3 Su-76 "tracking" T70 "recon mode"
T4 Su-85 "tracking" "focused sight"
so every tech building has at least one.
add "trip wire flares" to infantry from T0 if you want and every single SU building has a recon ability...
And please, have you even seen how much tracking adds?
It was ninja slaughter nerfed long time ago without relics word on it, sight was cut by 70% and cost was almost doubled.
Yes I have, have you?
If you want to refer to ninja changes pls be more specific, state when and what was those changes.
Using "tracking" a Soviet unit has the about the same sight radius as 222. Using both "focused sight" and "tracking" the SU-85 can spot forward about (a bit more actually) as much as 222 using spotting scopes...
PLS check your facts, before posting, so we can avoid unnecessary posts like these...