Don't care what you do, just hope you're willing to block off a quarter of 2024 to dedicate to nothing but thief goodness. The quarter is your choice obvie based on your life/job/family/health/etc. But one three month period of 2024 being used to improve thieflyfe with whatever inspiration you see fit. Thank you, and the thieves of thera thank you.

Read the rules

is wrong with thieves that they require a quarter of 2024's attention?

If a new thief path got added, is that the fix? Or is this more about the balance of existing skills, or the thief point tree system?

There's a few skills I'd argue for a boost, like some mystic skills, grenade, contact poison to trigger from contact type skills on a thief's armor (like throw, bash, savage feed, grapple, etc).

Curious of your mindset here!