Anyway this is a general thread about walker type ground combatants. Presumable far enough in the future that they work well, and contrasted against other vehicles that operate in functional contact with the ground (as opposed to antigrav stuff). This would include tracks, wheels, and I suppose if you want hovercraft.
First off I consider the key point of walkers to be their all terrain capability. I.e for stuff like
And in addition to natural stuff like that many countries even today use tank traps. Structures, usually concrete, that will prevent the passage of a tank. A walker would have no problem moving through these possibly without even slowing down. Also on that note a walker would be less likely to hit a mine. Both because of being harder to channel into a minefield and just because a tank will trigger any mine along its path whereas a walker would skip many.
Additionally tracks are highly vulnerable. I don't see why someone would consider it harder to break a link than to break a whole leg. However in a walker the systems are dispersed. If I fire at the tread of a tank I'm also firing at the engine, gunner, the whole thing. Also legs are moving back and forth as the mech moves forward. Making solid hits, especially from the side, rather difficult.
Also in the view of modern warfare you're also much further from IEDs and mines. Yeah they might take out a leg, and will almost certainly cause it to lose balance. But at least the bulk of the vehicle is intact. And at least able to crawl if not move along kneeling. Also some modern mine types would be of limited use against a mech. Most anti armor mines rely on some degre of shaped charge, and these require some distance to form. Stepping directly on one would actuall prevent proper detonation.
now at first glance they seem easier to knock down. But presumably they'd be made to get back up again. And also anti armor weapons impart relatively little momentum. Instead relying on extreme velocities at extremely focused points to slice through the armor and do damage via the burning fragments of the penetrator and the holes through the equipment. For example a KEW-A1 penetrator hitting a 60 tonne (weight of an Abrams) mech would impart as much momentum relatively as if a baby weighing a tenth of what you do crawled into you at 1 mph. Hardly enough to even register. The sort of weapons that would knock it down would tend to not be very effective against its armor. Energy weapons also shouldn't impart much momentum.
As a side note the military is working on walkers. Not like battlemechs but smaller ones for accompanying infantry in rugged environments such as a hilly woods where other vehicles couldn't get.
