The main reason you still need conventional armor instead of just EW is to protect against rounds from a tank, which an APS is unlikely to help against. I suppo

The main reason you still need conventional armor instead of just EW is to protect against rounds from a tank, which an APS is unlikely to help against. I suppose you could try to use EW to try and blind a tanks sensors and cause them to miss a shot, but that seems risky and not scalable. Armor also protects against lighter anti-armor weapons like the NLAW. While the NLAW is certainly a potent weapon, it will not penetrate the frontal hull of a modern tank, APS or not. Tactical mobility is a bit overrated, it's not like you can outrun an ATGM. Though a system with better operational and strategic mobility would certainly be valuable. Modern tanks can't cross a lot of bridges due to weight constraints, and can only be air transported in the largest aircraft. For reference: the C-5 galaxy, one of the largest cargo planes in existence, can carry 2 abrams tanks; the more common C-17 can carry 1; while the C-130 can't carry any (it could transport roughly 28% of an abrams). If you could get a decent armored fighting vehicle down to 20-30 tons that opens up a lot of operational and strategic transport options.