You make some interesting points, but allow me to play devils advocate for tanks with tracks:

• Can climb stairs and other obstacles (tracks can already do this)

• Can manipulate the environment (why open a door when you can just level the whole building, tanks can push objects out of the way especially if fitted with some sort of dozer front attachment, etc)

• Cannot jump (armored mechanized vehicles are very very heavy, and getting the kinetic energy required to launch one into the air in a controlled manner will take a lot of energy, batteries would need to be huge or some sort of nuclear power generator will need to be installed, definitely don’t use an engine for that because those forces on an engine will cause catastrophic damage)

• Not redundant (while losing a track means the tank will be stuck, it is doubtful that a mech with legs would be able to perform much better. If the mech had more than four legs then maybe, but why cant the tank have 4 tracks? Losing one wouldnt stop the tank either, as it can still make enough contact with 3 to continue in most situations)

• Is always prone (mechs with legs will have a taller profile than tanks in most situations, and in cases where a legged mech can go prone to reduce the combat profile the tank will be able to do basically the same thing with a much greater movement speed)

Also, for a moment consider cost. Tanks with tracks are expensive. Theyre expensive to buy and to maintain. However, in comparison to a six legged mecha a tank with tracks will cost comparatively like an econobox car compared to a Maybach.