The downsides are that it's quite a bit less straightforward than buying with something like Strike, etc. And you need bitcoin to start, for the bond.

Unless you're really motivated, Robosats is for people who are fairly technically adept OR are willing to do some research when the inevitable problems and questions occur.

The upside, of course, is that it's not KYC.

You need to have some Bitcoin on lightning for the fidelity bond, so someone who has zero bitcoin would have to get some from another source first.

There are. Perhaps I should have included them, but I have really never had any serious issues. It is still experimental, so keep your transaction amounts low. It lacks liquidity. Makers can wait a while to find a trading partner or never have the offer accepted.