I'm not sure where you got that piece of mis-information, but it is entirely not true. You may screw it down tight to the body if you like or if you want the strings to rest on the frets, but it is designed to be height adjustable just like the ABR so you CAN adjust your action.
First of all...trying it "once" should not give you the confidence to make such bold previous statements.
It IS true that the Nashville is wider than the ABR and that (depending on your guitar and how you have your bridge and stopbar setup) some strings MAY hit the back of the bridge. That can be corrected either by raising the stopbar (which I have done with great success on several guitars) or by filing the back of the bridge right under the strings that are touching it. Relieve the bridge just like you would relieve the back of your nut (toward the tuners) so the strings only touch a small spot at the front of the nut, or only on the saddle of the bridge. This is really quite easy and completely effective with no negative consequences on tone. And I have not only "tried it once" but have successfully DONE it MANY times.
I much prefer the Nashville because of its greater range for intonation which is necessary on some guitars with certain strings, and so I am willing to spend the extra time and effort to get my guitars "right". However, if you are lazy and just don't want to bother or don't care about your tone/tuning/intonation, then by all means stick with the ABR. And, admittedly, sometimes the ABR is all that you need to get perfect intonation on your instrument. But don't discount the Nashville just because you tried it once and it didn't work out for YOU.