I guess it is frowned upon in this way. After 4 years of using Vim, watching other people live coding in Sublime is like watching turtle crawl.

"C'mon faster!!"

Can be a bit frustrating actually.

I guess the reason could be that because Sublime edits are slower, as the live coder explains things, he/she needs to pause the explanation to finish editing before resuming the explanation. This interrupted flow is what actually causes the frustration.