I was thinking: do you remember Artemis' cameo in Chasing Sunsets? She was a super advanced Artemis. Maybe Chasing Sunsets was set in the year 2300. But the technology in that game didn't seem that advanced. I don't know, I'm confused.
For whatever reason, I was under the impression that Chasing Sunsets was set a few years in the future. As for Artemis being advanced, at the rate she's going I'm sure she'd be advanced enough for the cameo to make sense within a few months, or few years max. This is especially likely since Artemis is an optional LI, and I'm sure we won't be able to treat her as a LI until she's advanced enough to actually understand the implications of that.
Aren't those just simple cameo's though? The 3 I mentioned have story elements that further the plot, that was my point originally
Jaye's cameo appearance in Summer Scent is pretty significant, if you haven't seen it. She's there for a whole scene sequence, and on certain paths has a pretty length discussion with Eve that actually adds quite a bit of backstory character to Jaye.