The gregtech industrial grinder can do 300% + extra small dust piles on some ores. It also gives you 2.5 coal from each coal ore. Mycelium/grass to dirt is hardly a feature to write home about. If you were desperate to convert a large number of those to dirt you could also use a RP block breaker and deployer on a timer or a button. Stone to gravel can be done in a rock crusher btw. None of these features are compelling enough to dedicate the space required for a factorization setup. It's mostly redundant functionality that you'll get from IC2/Gregtech/TC and those have multiple ways to generate power that don't require access to sunlight and a large area to set up mirrors. If Factorization used MJ, I might add a thing or two from it to my room but in it's current state it's a bit unwieldy compared to Thermal Expansion which doesn't require other mods to move items from one machine to the next for processing.
Perhaps if it had more unique things to offer that other mods aren't doing already. Thermal Expansion is a great example, it came onto the scene after IC2 already cornered the market on macerating ore for double yield but it offered new functionality for convenience. Pulverized ore could be moved into a furnace automatically just by placing them next to each other. BC had energy pipes, but TE added ones that don't lose energy and battery cubes for MJ storage.
I'm hopeful that Factorization will continue to add new things that set it apart.