I hate to say this, but too many traits seems to make individual girls not more unique but less. Some of the girls in the various packs start with an huge number of them, often times redundent or contradictory.
I tend to agree with you. On the other hand, the girlpack makers seem strongly opposed. And since they are the ones doing the work in this area, I feel their opinion has to carry a bit of weight.
That said, I also agree with the notion that you should have room to add traits to your girl in game time, so in the interests of keeping some trait space for in game use, I have a proposal.
Firstly, the trait limit to be left at 60
Secondly, there should be a limit to the number of traits a the game will load from a .girls file. I'm thinking 30 is a reasonable value, since (IMHO) if you can't adequately describe your girl in 30 traits, you just aint trying hard enough. Possibly we could make the cut-off level configurable by the user so that those who think that more is always better don't have to feel discriminated against.
Thirdly, there's a good argument for someone going through the released girl packs and producing a mimimalist version with traits limited to no more than six or perhaps ten. It would only need the .girls file to be changed, after all.
So, that's one way forward. Comments welcome, especially from the girlpack compilers.