Yes, you make good points. 8 books brings the early uncommons, but it does seem like 9-10 books of a kind serve little purpose for early or mid game. That's a critical loss of early game snowball opportunities to get to your very rare spells. Especially in higher difficulties where the best players don't seem to pick more than 8 books.
no, starting commons is not necessarily the way to do it. But I'm just not convinced 9-10 books of a kind is really that worthwhile due to early game sacrifices, especially the 10th book. Maybe specialist (or omniscient, or either) should throw a little extra reward if you hit 10 books of a kind, or so many other ideas we could come up with to incentivize it a bit more for earlier parts of game.
no, starting commons is not necessarily the way to do it. But I'm just not convinced 9-10 books of a kind is really that worthwhile due to early game sacrifices, especially the 10th book. Maybe specialist (or omniscient, or either) should throw a little extra reward if you hit 10 books of a kind, or so many other ideas we could come up with to incentivize it a bit more for earlier parts of game.