i did that on my CX bike but switched it back. i have a 1x setup and figured the separate hands to shift up or down would be nice, esp with gloves. after 1/2 a season, i switched back. i just didn't like it. i was never so panicked that i hit the wrong button when right right shifter controlled both movements -- maybe i wasn't racing hard enough or my gloves weren't big enough. also, for whatever reason i found it easier to brake with my left and and shift with the right -- when set up with the shifting split, there were times when it was more awkward to use the front brake and shift to an easier cog, to set up for a feature.

having to press 2 buttons to effect a front shift is something that would require a bit of convincing for me. maybe it is better.

ymmv, of course.