I’m not sure what you’re arguing for here, really. Yes Pharah also uses her fuel to stay airborne, most of her air-gain is from her Jet Booster ability, not so much her fuel. But that… doesn’t change anything about what I said. This buff gives her more mobility options, one of which is that she can now ground herself faster and thus get the faster recharge rate on her fuel. If your argument relies on a world where Pharahs never want to use their jet fuel for any upward movement (which is not how the world actually plays Pharah – there’s plenty of opportunities and high ground options she can reach using fuel alone), then this buff still doesn’t require an additional buff for more air movement, because she’d be staying grounded for effectively the same amount of time as she does now.
… But Pharah does use her fuel resource for just smaller jumps and for making use of her faster forward movement when flying. Mid-duel, she wants to have fuel to keep herself agile. So I do think being able to ground herself sooner and thus regain that fuel charge is already a good perk on top of a buff that is full of only-good perks. Her mobility in the air got a big improvement and she got nerfed nowhere else to make room for it – I can’t help but think it’s just greedy to also ask for even more jet fuel, as if this buff is somehow actually a burden on Pharah that needs its own sub-buffs.