Yep lots of benefits which is why I'm making the move. Been bottling for about 20 years.
Have a semisweet melomel I am making that I want carbonated, so the only way to do that reliably is forced carb. Need kegs to do that
Beer is just easier and I will likely continue to "cask condition" with the kegs but still bottle some for sharing, etc.
I like the carbonated water thing too, What pressure do you use?
For the carbonated water, use a higher psi, like 30 psi or so. To serve, you need a much longer line and/or use 3/16" id beverage line (instead of 1/4" id) or use a gadget like the one discussed here: https://www.homebrewtalk.com/f35/cure-your-short-hose-troubles-100151/