We plan to buy roughly 2,400 of them, plus our allies are buying a whole bunch, so they will hardly be outnumbered by the enemy the way Tiger and Panther were. Also, it is not about speed and maneuverability, its about combination of sensor fusion and advanced networking to maximize situation awareness, also combined with denying the enemy the same through stealth and most advanced electronic warfare ever built into a fighter.
Situational awareness is what warfare is about. Think about how US infantry in Iraq routinely routed Iraqis in ground battles and city fighting especially at night with 10-1 or better ratio. Are US soldiers 10 times faster than Iraqis or is AR-15 10 times better than AK-47? No, it's the fact that our guys from the command down to squad level knew where they were and where the enemy was and they could choose the time and place of engagement and the enemy had no clue what was going on that made all the difference. Night vision equipment made more difference than guns.
I think building this from the ground up sets us up better for the next 50 years than trying to hang more and more stuff off the existing platforms. Now, was it worth this much money. Idk, maybe not, maybe something else could have been built that wasn't quite so expensive but its kinda too late now.