There is a reason reduce is the first R. Not consuming energy in the first place is less carbon emitted today and less generation capacity that needs to be transitioned. It really is an 'every little bit helps' situation. Dismissing solutions as too small ignores the fact we need hundreds of thousands of small solutions along with many, many big ones.
Eating an animal-product based lunch will use more energy than years of iPhone usage. This is certainly not a "every little bit helps" situation - it is about managing our attention on things which actually matter, when there is a war going on to distract us from it.