"Powercreeps" are always bound to happen, because at EoS the strongest abilities will be fully revealed.
The fact that logia awakening still not has dropped officially, goes to show you that Oda plans some big stuff for the final saga.
The question rather is to which degree it stays reasonable and comprehensible. And I think even with the Imu and Loki feats it's still fine.
Imu feels in range and bound to inverse logic and abilities, even if he is that powerful.
He feels much more like Nagato/Pain than Kaguya for comparison.
Imagine him blocking a Bajrang Gun bare handed and not that Genie fist and you know the level of ridiculousness that potentially could have been.
I think the full potential of the strongest DFs when shown on panel will just be a hard pill to swallow for a lot of people, even if a lot of insane stuff was already done hundreds of chapters ago.