I’m going by the more traditional usage of the terms, and even the expanded definitions don’t provide the clear age ranges I need as far as archive content warnings. Reading about a 16 or 17 year old having sex is one thing, but when the character is under 13, it’s a huge trigger for many readers. Even being under 18 can be a trigger. Neither shota, gay or straight, nor loli provide that clarity. I will grant you, in most of the shota I’ve seen lately, the boys are definitely falling into the Minor1 age range, so do we consider shota one of the major trigger tags, too?
Loli got its name from the Nabokov novel, of course. That artificially enhanced young-girl image appealed to the ecchi audience, and it’s still a big part of the Harajuku cosplay scene.