Yeah. When it comes to mud and wet leaves, I recognize the felts as being worse than rubber. There's trade-offs in everything. The thing is, they're not that bad, and I'm more often walking on rock. From a safety standpoint, you aim at the worst problem, and that's wet, slimy rocks.
It may be that the newer rubbers on the more expensive boots are as good as felt on rock. I haven't tried them yet. I've only dealt with boots well under $100, and the lug soles in that price range don't yet compare to felt. I'll keep an open mind as the newer rubber designs come down in price. This is a switch I'd like to make, as I do believe that felts accelerate the spread of invasives. I'm just not willing to sacrifice my safety to save me a bit of a hassle in proper cleaning, and nor am I willing to double the amount I spend.
Snow, absolutely, felt is TERRIBLE in snow.
For the price of one pair of SIMMS' cheapest non-felt model, I could buy 2 pairs of the boot I currently have, and rotate em.