If it wasn't for someone at Yamaha playing in bits to create the styles (intro, endings, variations etc) and saving what they've played as midi data, you'd never have any styles to use. Same with the other companies who create arrangers. Styles definitely have their place in music, great for a quick sit down and play and handy if doing a one man show with a singer or solo, but they definitely do make you lazy. Repeating patterns can be very restrictive and at the end of the day, all you are doing is triggering someone else's preset midi data with your left hand when playing chords.
Your right hand and left hand is playing live, but the parts playing in the style is not your playing, unless of course you have created the style for yourself.
Some people think multi tracking is cheating or not playing, but try creating a song from scratch without using any style. Play in your own bass line, drums, all the accompaniment parts, essentially creating your own accompaniment. That to me is far more rewarding than using any style, but as with any music creation, everything has its own place and it's the end result you listen to. There's lots of skill involved in multi tracking as well as turning all the accompaniment/gadgets off and just playing live. Using computer software and VST instruments, samplers and romplers, you have to learn how to use all of the software and not just learn how to use one arranger keyboard, then there's learning how to use a DAW which hosts a VST, where to place effects, mixing and mastering etc, it's far from easy.
Organs without the auto accompaniment were fantastic, I started off on those back in 1978/9. The likes of Wersi, Roland Atelier, Bohm etc cost an arm and a leg these days, so no wonder many ex organists have moved over to arranger keyboards, but with modern technology advancing all the time, sooner or later arrangers will be far more software based than they are right now, so if you don't embrace technology, you get left behind.
Regardless of what you use, how you make your music, as long as you enjoy it I think that's the main thing
Personally I multi track at home creating all the parts myself, but I'll use styles if I want to relax and just play something for my own enjoyment. When I go out playing all the technology stays at home and I'll either use a style if using an arranger, or I'll also put it into full keyboard mode and play it as I would a piano. If out with a band as I was recently doing session work, I take out synths instead and play 100% live.