@Berners15 - didn't know about omni'nettoyant. Think I'll pick up a bottle.
So, assuming Carmina is using halfway decent suede, is there really any need to fear little rain here and there if I left them unprotected?
Hangerproject do a great suede care section.
It would be dangerous for me to advise because it's a two way street. Yes suede protection works, and you may be overjoyed to have used it if the red wine goes flying.
I can only state that I do not use it and salt and water marks etc do not cause a problem for me. There again I rarely go splashing around in puddles on a suede day. You kind of have to weigh up the pros and cons. My father has a dark brown pair of Cape buck chukas and they must be a good 30-40 yrs old and they are unmarked. Lighter coloured suede is slightly more problematic.
Best of luck to you in your choices.