Not easy to eat 6-8 solid meals a day and getting in enough food/staying hungry enough when you're trying to go from 260 to 300... I get your general sentiment, of course, but I also think that people focus too much on extremes... I.e. all/mostly solid food, no matter what, or way too many shakes and too little solid food... I'm not able to eat 8 steaks a day, personally, so getting half my protein from shakes works perfectly fine for me. I didn't need to do that as a 120-220 lb guy, but after some time I've found that it helps greatly and makes the entire journey a lot more pleasant for all involved (i.e. my better half, haha).
You could also work the "change" into your current routine.. Instead of changing in any major way every x weeks, have a double or triple rotation for your exercises (at least as an advanced guy) or something like that, as an example.
That way you get both change AND you get continuous progression on the same movements.