Giving FRP to SU and OST would change only one thing.
Games would becaome huge cluster fuck.
The question is, why Relic gave FRP to WFA factions in first place.
You ca use asymetrical design for units, tiers but not for something what give you 5-10min better map presence during 1h game becasue it's no longer asymetrial but unbalanced.
Guards gonna die really fast when using button next to JT - it's not that easy.
In the end, if enemy won't overrun his JT/Ele, game will became more and more in axis' favour unless you put everything on one card and rush with all your tanks and AT gun ust get rid if those heavy TDs.
KT is not an issue at all but Ele and JT are different.
SU don't have fast flanking tank destroyers. Their best TD, SU85 is melted by Ele/JT.
They don't have powerful TD with turret and tulips.
I'd say ingore it and use infantry but since OKW blob with Fusisilier and Obers will melt SU infantry, you are force to use vehicles.
They only way of to kill Ele/JT is to catch it out of position, get behind, block and finish it. But still it's just easy in theory becasue of schrecks blobs etc + if we assume enemy won't overrun his JT, well, it's not that easy to handle it.
Try AT nades with IL-2 bombs and mart targe to make it easier.
Recently Ive killed tons of JTs in 2v2 by spamming KV1s and rushing with 4 of them at once from different directions combined with Shocks on Motherland's steroids.