Conspiracy Theory: the reason of (not only) E-series nerf

LiannaSilverwind: What do we see, what do we get?
T-54: 2 nerfs, 2 model changes (including height changes, ie. additional nerfing)
Pershing & Patton: 2 boosts, 1 model change
Panther II & E-50: 1 boost, 1 nerf (stronger than the boost before). 1 model change
Lorraine & Bat-Chatillion: 1 massive nerf.
What do current unofficial statistics tell us?

EU server win ratios (link)
T-54: 49.8%
E-50: 49.26%
Patton: 50.61%
Bat-Chat: 52.42%
IS-7: 49.02%
IS-4: 47.84%
Maus: 50.24%
E-100: 47.64%
T110E5: 52.1%
AMX 50B: 48.31%
RU server win ratios (link)
Т-54: 49.76%
E-50: 50.46%
Patton: 52.24%
Bat-Chat: 53.73%
IS-7: 49.46%
IS-4: 47.25%
Maus: 51.23%
E-100: 49.21%
T110E5: 52%
AMX 50B: 51.51%
E-50 is not best or 2nd best medium tank on both servers.
RU server T-54 stats are similar to ours, other medium tanks have better ratios than EU ones.
RU server players also drive Mice, E-100 and AMX 50 B better than we do. IS-7, IS-4, T110 ratios are similar.
Now to the conspiracy!
Date: 15th February 2011
Link: here.

LiannaSilverwind: Q: Do you plan tier 10 medium tanks?
A: Not for immediate future.
Date: 22th March 2012 (one year later)
Link: here.