I just hope that Gmail itself (as client) becomes something other than a Less Secure App. Right now I have to keep that LSA switch going so that my main Gmail account can SMTP send mail with credentials from my other many Gmail accounts. I've never understood why Gmail itself is a LSA in the eyes of other Gmail accounts.
I don't know why it is that, but I know why it was that at one time, quite long ago: One team had set terms for what avoids LSAness, another team hadn't updated some code to match the new terms.