I am not following everything in the DMG.
Honestly, if I ever tried giving less XP based on tactics, I am pretty sure my players would riot.
I only brought up the quote about encounters requiring resource expenditure to give CR to show that sometimes the DMG is even more hard-core about enforcing resource expenditure than I am.
I was discussing this as a possible reason why my campaign might seem to hard despite otherwise sticking to the DMG guidelines. Pointing it out and saying that it deviates from the DMG isn't really proving any sort of point of saying anything I didn't already say in the OP.