Sure I’ll bite. I’m an all-around developer using a variety of languages (primarily Go) for my work, and a long-time emacs user, who recently switched to Sublime Text as my daily driver.
It is blazing fast, customizable enough, and with a small assortment of plugins it gives me all I want from a code editor. Couple this with Sublime Merge (also excellent software and a nice drop-in for magit) I have everything I need to focus on my work without thinking so much about the tools.
Copilot integration has improved a lot since the time of your message, particularly because github themselves released a much more feature-full library to interact with copilot.
Sure, vscode might have a better UI for this particular thing, but ST does well to emulate it. Even “insert code at cursor” buttons/etc work well.
Otherwise if you want a deep/long AI chat you would want to go to your browser anyways, the tiny panel format is not suited for that (in vscode too)
Try it out for yourself and see! (remember to update the LSP-copilot and LSP packages through package control)