Vim is more of an investment and I tried to really get into vim over the years but I didn’t. I did get good enough with it to use it when sshing into a server. Sublime just clicked. It worked for me from the start. I bought an IntelliJ license at the same time I got my Sublime license and Sublime just worked so much better for me that I never looked back.
So while you might be right from a “logical” standpoint that learning one editor in and out might be the “better” choice, you overlook that I “feel” way more comfortable in Sublime Text and that matters way more for something you use on a daily bases.
I don't know very much of vim but I think it is very extensible and can be used as a complete IDE for most of languages. Wouldn't it be more convenient to always use vim over switching between vim and Sublime ?