I'm gonna read through this discussion a bit later, it's very interesting.
One thing caught my eye though, the TD vs LT discussion, so a quick response. These articles are meant mostly for non-high-end players for kinda obvious reasons. First, players who can truly see the consequences of some choices are very rare. Second, most players who read these articles are average (by the very definition of the word). Hm that sounded a bit weird, but you know what I mean.
My point is, for most players, you gotta define expectations first, because that's the starting point where the opinions will come from. Most players do not think in shades of grey, they think black and white, or, more specifically, black or dark grey (black with some leeway) and white or light grey (white with some leeway). So, in this specific case, defining TDs as snipers is an important aspect because it ensures that players will try to first play them as snipers and then move towards the grey zone when they find out this isn't working all THAT well. Likewise, defining LTs as flankers is important because while the same players will start that way and then gradually move towards the TD role.
The reality is that both classes basically occupy more or less the same niche of "second line fighters". TDs (excluding some weird shit like BMPTs) are better at longer distances, LTs at shorter ones, but the truth is that the role of a "flanker" is a fictional one, at least for LTs. LT flankers are a myth - they don't work because the maps are too small. So what you have instead is something like faster "marksmen" and less agile and more fragile "snipers". But, if you describe it like this to wider audience, we're getting to what I described above - players don't think in scales of grey, they think in absultes. In other words, they will understand "kinda the same" as "totally the same", which it is not, there will always be nuances, either in different characteristics or indirect ones (for example, TDs don't typically carry ERA, which is pretty significant given the upcoming changes). Getting really deep into these statistics and rebalance, you'll start discovering some really weird shit, such as the Type 16 is effectively a wheeled Light Tank and a better LT than some other LTs to boot, yet it must retain its old class because it would completely mess the basic narrative of the game - when all vehicles are the same, it will become incredibly difficult for new players to orientate (and yes, we are getting new players, every day).
There were thoughts about merging LTs and TDs into one class (FSV), but this would be REALLY complex. Right now, every single TD and LT has its seprate table in developer files where its battlefield role and intended gameplay is described. In other words, we're not cutting legs to fit the shoe, we're changing the shoe size to fit the leg - or, we're assigning classes to fit the vehicles based on how we want them played, not vice versa.
I guess the TLDR of it all is, you'll see what happens. We all will (that's why I am specifically avoiding giving any numbers because when everything changes, listing specific changes makes no sense).