Well I like it and I use it. It allows me to indent everything vertically without having to line everything up manually. It also allows me to use a proportional font and I don't have to realign everything manually.
If Rust has guidelines for spaces instead of tabs, then I can't use this feature in my contributions to the Rust ecosystem. But if anything, the practice agreed on should be the best practice, not the most popular. If the Rust IDE has automatic elastic tab stops, then I would prefer this to be the default. If not, I don't see how forcing me to use spaces is a good thing.