easier to
>train
>mass produce ammo, firearms
>have soilders carrey additional weight so not only to combat regular troops but armor equipped troops
No, not to mention how effective PA troops would be on 2nd-3rd world countries militaries. The benifits outweigh the downsides.
If it is a 1st world power vs 1st world power in all likley hood there will be seleted squads established to specifically counter power armor troops. Or a single man in each squad that is trained and equipped with the PA-killer weapon.
Making them obsolete.