I agree that xox is too tight. I only advocate xoox.
Seriously, I used to think just like you. And I used to think that even if the xoox pattern was more successful it would be less fun.
In my experience it is less fun. In a way. But with the results I've had I simply couldn't go back. There's fun in winning too.
Anyway, I just wanted to share my experience and perhaps help someone like me to try something they hadn't considered before. I'm sure not everyone will find it fun to play this way.
To address your concern I can guarantee it's not a waste of tiles. It's quite the opposite actually. You will use many more tiles for longer periods of time than if you go OCP. While it's true that the 20-cities eventually would use all of them (except a few wasted shields inbetween) by the time of Hospitals (which I get to faster with this build pattern) I have already pretty much decided the game and the issue of possible wasted tiles don't seem so important by then.
Also, there is less wasted shields with more small cities. No more 87 shield cities building 2-turn 90 shield units. While every city takes a turn or two longer to build something you get many more of them in time and with less overruns on the last turn.
I also find no truth to the claim I see sometimes that you get less territory with xoox. I can claim more territory by virtue of having more cities building Settlers and if by chance I were to get less then I simply build the units to take more. And in any case, the land I DO have is more productive by virtue of working most of it sooner. This is on large maps, I know nothing about smaller ones.
Anyway, I hope my enthusiasm has persuaded you to try it once. I wasn't kidding when I said I couldn't believe what a difference it made. For me, it was a jump of two levels of difficulty. But as usual, your milage may vary.