Grease, and the effects of what happens to it and the accompanying drippings do affect the taste of the finished product - at least when grilling. The evenly distributed heat helps, but what does our with heat is how much hotter charcoal & wood burns, compared to gas.
I know there are people claiming you can get hotter with gas, but that happens only in concentrated areas under ideal circumstances. Unless you are cooking sliders with an acetylene torch, don't talk to me about how hot your gas gets. Even these new sear burners are only a gimmick; an attempt to mimic the searing capabilities of charcoal.
I guarantee a black and blue sirloin has more flavor than a rare sirloin. You cannot do black and blue using gas. And no matter what fancy rod, ceramic, composite, infrared, ultraviolet, ion, or matter-antimatter pulse setup you're using, you will not have control over heat distribution like you do with charcoal/wood. The further you get from the originating heat source, the lower the temp. The lower the temp, the less likely I will be able to sear & seal the meat.
I am not talented enough to work around the shortcomings of gas to get as good a result as some of you might be able to achieve.