I have tried Easel in the past.
I suspect the big part of it's popularity is down to X-Carve, rather than the software being popular in it's own right.
I'd guess things like Vectric have far larger user bases, as they've been around for far longer. It's just they don't do shiny videos extolling how easy it is to setup a business from your garage

From what I remember, Easel was pretty limited in how much you could customise things, as it is aimed more towards beginners.
That's not a bad thing, as it helps reduce the learning curve (or totally eliminate it, if you never venture beyond the basics), but for those wanting to improve how parts are machined, it's certainly not a good thing.

The only thing Easel does in regards to speeds/feeds, is makes it a bit easier to adjust speeds/feeds in the software.
Any decent CAM package lets you adjust them, it's just that you need to know how to get the numbers.