And he's right it's only way to get it is usually retraining, which may not be allowed. That's bothersome.
For the OP, allow retraining.
At the risk of turning this into an advice forum question...why?
Let's start by distinguishing between retaining and rebuilding.
A. Retraining uses Paizo's rules here. It allows you to...
- Retraining ability score increases one at a time
- Change archetypes (longer per alternate feature)
- Change a class feature to another "you could otherwise qualify for at that point in your level advancement." (that part is really important)
- Change a class level
- Change a feat to another that you currently qualify for, even if this would not be a legal build starting at level 1
- Increase hit points up to maximum
- Learn a new language above and beyond the normal maximum
- Change racial trait
- Change a few skill ranks at a time
- Retain a spell known
B. Rebuilding is the ability to just adjust your character per GM approval (aka, don't remake your character to specialize against whatever the party is currently facing -- so far I've approved every rebuild). Aka, you can rebuild your character from the ground up, essentially. This allows to you...
- Change every ability score increase if you wish
- Adjust your level 1 stats if you wish
- Swap archetypes
- Swap a class feature to one that was legal at the time
- Swap levels
- Swap a feat to one that was legal at the time
- No effect on hit points (players already get maximum hit points)
- No effect on languages except being able to change them
- Swap racial traits
- Swap all of your skills if you really wanted
- Swap out a bunch of spells if they're not working as you hoped
Retraining costs time and gold. Rebuilding is free and instant (though not in the middle of combat).
Now, as far as I can tell, there are only three ways where retraining isn't flat out worse than rebuilding...
1. Rebuilding doesn't allow you to learn extra languages
2. Rebuilding has no benefit for hit points...but they're already maximized
3. Rebuilding feats follows the same rules as rebuilding class features...unlike retraining.
And the third point bothers me most -- why can you give up a low power level 3 feat to get a high power level 15 feat while you cannot give up a low power level 4 rage power to get a high power level 16 rage power (or rogue talent, or magus arcana, or whatever)?
For the record, I think the way the class features handles it is correct...hence why that's how I treat both feats and class features during rebuilds.
But the player is arguing that the existence of this feat proves that retraining is intended because otherwise there's no way to get the feat at level 10 when you can qualify for it.
Of course, there's not a level 11+ Skald sitting around nearby so this would require the Skald to spend his own gold (fine, it's his gold) and hold up the party for 10 days...in a reasonably time sensitive campaign. Or he could take time to search one out which would then likely take just as long. All to get a character that wouldn't be legal if built again from level 1. And all solely because it requires Perform 10 rather than 11.