Unless you want the new MBT2000 and the WZ1001, (which you do as they are important in lineups), this does technically reduce the amount of RP needed to reach the end of the tree.
However, it often makes individual steps in the process worse with the new folders.
For example, the ZTZ88B and ZTZ88A are two nearly identical vehicles that were once one after the other, costing 180,000 RP each for a total of 360,000 RP.
Now the 88A is foldered, and only costs 135,000 RP. However, the 88B costs 220,000 RP, 40,000 more than before, making the time between new vehicles slower. and the overall cost of getting both of them is 355,000 RP, only a miniscule 5,000 RP decrease.
Yes, the overall cost of going down the line has decreased by 140,000 in this case, but the speed of new and interesting unlocks has been slowed by quite a bit. And of course, you actually need to research the leftmost branch, which adds a whole boatload more research needed for only 2 useful vehicles.
My hope is that they remove the increased cost added to a vehicle for it being the start of a folder entirely.
All this does is disincentive taking advantage of the cheaper in-folder costs, as you have the next start of folder cost spike looming over your head.
(PS: they also need to make the M41D, M60A3 TTS, and CM11 not completely garbage too)