No, these days microinverters aren't the bottleneck. The IQ7 can handle up to a 460 W module, with 366 VA output. The IQ8 can handle up to a 540 W module, with 384 VA output. 97.6 efficiency.
Mh, from Enphase catalogue in my country (France) I do not see such data, the IQ8 are not on sale here and IQ7 variants arrive at maximum at 315 VA for the IQ7X-96-2-INT witch is the top performer on sale here. Anyway, it's still less than classic string inverters even if they give "resilience" and "installation freedom"...