I tell players not to expect any particular magic items. They shouldn't expect to have all their attunement slots filled, either. They don't get to plan around a magic-mart. If that means the build the internet told them is perfect might not work, too bad.
PAM is strong. Players picking it might not get the perfect pole arm of their dreams quickly, or ever. They might die, too. Using a battleaxe or scimitar is probably preferable to dying.
It isn't like 80% of the monsters in the MM have resistance to non-magical weapons, and it isn't like some magical weapon fairy is going to distribute magical weapons of the preferred type throughout hell or the underdark with the party in mind.
Every paladin has magic weapon on their spell list, every blade warlock has access to improved pact weapon
And, of course, anyone can have a weapon silvered for 100gp.
Of course that's the case.
It's not quite as bad as spiked chain builds in 3e, but it's close.