I think it's a huge myth fish do not like higher currents.

They get fat, lazy, just like us.
They do not look as nice, they do not behave like they should, they do not eat nor grow as well either.

Like us after exercise, we are alive and hungry.
Some use powerheads for 2-4 hours a day/at night etc to exercise their fish.

They want rest, they can wondering into the plant beds.

Regards,
Tom Barr