No idea where you're getting the idea from that the 2D emojis are still used anywhere. What you're saying used to be the case. but about a year ago MS decided to roll them out as new default on Windows 11.
I enter text in Wordpad and it shows 3D emojis. I open Emojipedia and see 3D emojis. I replaced the old font on my Linux system with the current one and now see the 3D emojis. I open the font in a font viewer and there are 3D emojis. It's all 3D.
