I'm not saying that it's completely bad, but with Bitcoin the devs work really hard to improve the software to make sure that the time for full resync doesn't grow too much, and that it can run on an average laptop that has SSD.

The biggest problem with the fast sync is that sometimes when Ethereum node gets stuck, the devs just suggest to do a new fast sync, which - in my opinion - requires enourmous amount of trust in the developers. Hard forks also require a lot of trust, as old software can't be run side-by-side with new software to validate the blockchain.