That's where drones come in. Power armor is not this silver bullet that beats every scenario it encounters. It's best used in conjunction with other tools, just like every other piece of equipment.
Ironically, I actually see drones making a stronger case for power armour.
Suicide FPV style, and the more advanced loitering munitions swarm kinds are proving to be a real headache for armour, and no one has as yet demonstrated an effective means of hard countering it. All the gloat and cope by western fanboys about their hard kill systems being able to deal is proving to be just that as the Israelis are finding out the hard way in Lebanon, and Hezbollah are just amateurs starting to dip their toe in compared to the Russians or Ukrainians. Even the PLA is starting to add cope cages to their armour.
If our IFVs are liable to get blown up by drones with large loss of life each time, power armour starts to make more sense as it can vastly reduce your casualties, as troops in fully enclosed armour could potentially shrug off even very close range frag blasts, or at least survive without major injuries.
Sure an FPV with a shape charge can punch through Power Armour, but only if it can score a direct hit, which is actually not that common as most FPV kills against infantry is from close proximity blasts. It’s only when infantry gets pinned down behind cover and are not able to effectively move and disperse that you tend to get more direct hits. And FPVs with shape charges are even less likely to do damage to power armoured troops from near misses.
On top of that, PA could allow troops to carry much more powerful anti-drone jammers or hard kill countermeasures.
The ultimate irony could be that PA isn’t even developed for humans, but as a means of adding armour and strength to vast numbers of non-combat civilian drones to make them more combat effective instead of being dropped en mass by basic anti-infantry firepower and shrapnel.