Some of the best carts in the world have an “unprotected cantilever”. Just use a bit more caution. Minor issue if even that. Like any subject in the HiFi world, you will get a million opinions. You’ll have to try somethings for yourself and see where you land. A replaceable styli is a nice feature of some MM carts, but shouldn’t be a deal killer alone.
@geof3
If you’re talking about VdH, Lyra and a few Dynavector (with unprotected cantilevers) when you think they are "some of the best in the world" I want to admit that all those cartridges are LOMC (not MM or MI).
But the OP asked for MM at $800, and user replaceable stylus is a MUST HAVE for MM at that price.
Yes, "it shouldn’t be a deal killer alone", if someone can spend for example $14 000 they could buy this Coreless Straight-Flux Cartridge, and each time they will have to ship it back to the manufacturer for stylus/cantilever replacement just for another $2000+.
Here is the review for Seiryu (Blue Dragon).
Interesting that $14k Seiryu (Blue Dragon) Coreless straight-flux cartridge was designed by Hiromu Meguro, former design assistant of the GRACE F-8 cartridge and principal designer of F-9 cartridge, when he was with Shinagawa Musen Co. Ltd (Japan) in the 70s.