Yes, as said earlier
1. backward compatible changes
2. backward incompatible changes
are what should be contrasted and dealt with most of the time.
New connectives, adding any number of new words is 1.
Xorlo is 2.
I'm not against 1. ("gismu space is huge" cu'u la .camgusmis.)
E.g. fi'o te sidbo la .camgusmis. people reading old texts would wonder what those strange gismu mean and would look them up in the dictionary finding out that those gismu were used long ago meaning this and this.
But this situation is quite different from repurposing cmavo and gismu.
I'm pretty against such changes that would divert people, would raise (and already raised in past) antagonism. I myself had to make certain changes in my project to find a better compromise between those tinkerers and hardlinerists.
Xorlo was an unlucky part of Lojban history where the founders like Lojbab didnt see it as a change invalidating CLL, and the others didnt bother of amending books and the dictionary.