The changes to the pieces that have been made in Revised removes “MUST build Infantry or lose” dynamic that existed in Classic.
Tanks now attack AND defend on 3’s, making them worth spending 5 IPC’s on. Now even Russia will buy some tanks instead of endless buys of ONLY Infantry like in Classic.
Fighters have had their price reduced, makign them a far more common purchase, again Russia will even sometimes buy FIGs in Revised where that NEVER happened in Classic.
Two hit battleships, cheaper Carriers, increased transport capacity, the addition of Destroyers, have all made navy a more common buy (instead of just TRNs and SUBs)
And even good old Infantry has gotten a boost, by pairing it with Artillery, to get some fair offesnive punch.
Tanks defending at 2 would make Tanks not worth buying; INF and ART pairs would ALWAYS be a better buy if ARM only defended on a 2.