A bit of nitpicking.
You know, if we have mechs, I'd like to think we've passed the point when we have gynormous gears.
Those are not gears, but spools for the cables pulling the machine up. Besides, the alternative to gears would be to have an electric motor on each moving part, which makes sense for cars, but not too many other applications.
Now, I'm just spit-balling here, but why don't we try armouring everything, instead of just the core?
Because armour weights a lot ? quite important for air drops.
So, actual battle-ready mechs is not something we are going to be able to achieve for a long time, but tanks with jets? We could do that now!
Could we? F-35 Raptor produces up to 186 kN of thrust, which is enough to lift about 19 tons. An Abrams tank weights over 60 tons ? it would need the thrust of 3 bombers just for rocket-assisted descent. This, not even counting the weight of additional fuel or engines themselves.