I mean it's not like blocking is important in this game.
Only people who want to win think that way.
The bug where light spam can't be blocked, especially on reflex guard, because it will just remain black once hit, so it never recovers and all the rest of the spam will go through automatically, has been there for at least a year now.
It makes facing light spammers unplayable.
The advice I have been given was to parry or deflect.
I will have to extensively test that, but I still don't understand why the reflex guard should be unable to cope with light spam. Even just thematically it should be BETTER than normal guard for dealing with fast stuff.
I have a feeling it is required to reset and re-position your guard to block light spam with reflex guard, but the general problem is basically that whatever solution there currently is, it is a very high-skill solution to deal with a very low-skill attack. The opposite of balance.