The character thing... No, not really. I mean, it does bother me when people switch sonas more than once a month, and with every one of them claim this one will be forever, mostly because it's like... how can you still believe that after all those changes
But I personally
don't agree with the people who find it a waste or think the art was drawn for nothing. I keep all art of my characters, even with outdated designs, and the sentiment behind the art is still there. My best friends both changed their main fursonas in the time I've known them, and I still like to look at all the art of us three together, because I don't think "that design isn't used anymore, this drawing is such a waste now", I think "I love this drawing and was so happy when I saw it, it really represents us as best buddies" or "I was really happy when I drew this, because I love this person and they deserve all art they can get". Not saying it's wrong if you think otherwise, but it's how I personally feel! Plus, people change, their characters will change with them. Development is good! Even if you personally dislike the design evolution, it's good they find themselves.
If they constantly change to really random usernames, I get confused a lot
But after all, it's their choice. I just won't be as interested in their work if I forget who they are all the time.
As for deactivating, I do get worried, but ah well