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It's not faster reserves the problem, it's the whole Soviet and general changes package that is bad atm. I got a long post in the making but i got a black out yesterday and now i'll push it later in the proper thread.
To give a short answer: this is just a nerf to T4 rush for either T3476/Katyusha which neither is strong atm. T70 is getting properly nerfed but nothing is improving it's timing nor the effectiveness of Soviets mid game transition.
The mobilize reserve is an excellent upgrade for holding ground, specially behind sandbags but not so much if you need to gain ground.
On it's own, 100mp 20f doesn't look as much. But now compare what ALL other factions are paying for equivalent tools at similar times. The medic cost reduction of 50mp is great but still they are mp inefficient across the board for the first 10 mins of the game.
Enough offtopic for me here.