The discussions are pointless BECAUSE you look at GCS. 1v1 is a very special game mode and totally different from team games. Every decision you take to balance units in 1v1s (buff Jackson) has a severe impact on team games (now only Jackson spam plus blobbing USF infantry). The problem is that this is not considered. Take for example the upcoming changes to sappers which will get AT nades. At the same time you would need to nerf the at gun's accuracy because the only justification for it being so accurate is because UKF has no at nades. Since they probably wont do that, it will stir up balance quite a bit to a point where I really dont see a reason to build a Luchs anymore...
The advantage to build a light vehicle on teamgames is diluted by the fact that you are fielding more units on the map, therefore you are not stretching as thin in order to maintain map control. This gives less space for this type of units to shine.
The fact that you can skip tech and rely on your allied in order to fast tech is also another factor, as well as faster capping and benefiting from allied caches.
You are also wrong regarding that teamgames are not considered. In fact, the latest 2 years had changes focused on teamgames, and some of them actually broke the factions for 1v1 (see UKF and USF).
About UKF, welp, AT nades are been served to RE not IS. And unless you are far into the late game, you are not gonna have more than 1 or 2 of this squads in your army composition.
It's gonna be interesting to see what the upcoming 2v2 tournament will show us.