[choilive]

The skin effect is an important difference (and advantage in favor of HVDC) so it is in fact a concern of AC vs DC.

[mlyons1340]

True, skin effect limits the conductor size (~22mm in Al @60Hz) but overhead transmission already uses bundled conductors to address that as well as to improve mechanical strength, cooling, and reactance. The advantage of HVDC is in the lower dielectric and reactive losses while skin effect is minimal.

[lazide]

Also inductive losses, which are only a thing in AC.