Cotton wool is a bit extreme...! I see where your coming from with just sticking to what you know. But these tools do make your work easier and can increase productivity. Same as saying: you can apply by hand, it works, same results every time. Why use a machine?
Ive tried all the new fandangled tools that come on the market, believe me if there is a quicker easier way to apply and finish then i would know but there isnt. Ive got speedskims, s*p*r*lex spats, sponges, plastic trowels ive tried machines, Ive gone toe to toe skimming with a guy using a machine and he was no quicker i always end up just using my handboard and trowel, its tried and tested. There is no easier or quicker way!!!!