Refuelling was banned because 1) it was dangerous, and 2) Ferrari at the time was dominating with Schumacher, they had perfected a technique based on multiple refuelling stops during the race that most other teams couldn’t employ (they had different tire manufacturers that couldn’t match Bridgestone’s performance on short stints). So F1 banned refuelling and moved to a single tire manufacturer for everyone (as well as banning in-season tests, which only Ferrari and a couple of other teams could afford).
Bernie Ecclestone and Max Mosley, for all their shortcomings, were absolutely ruthless when it came to nerfing teams to guarantee competition. After they left the scene we’ve had almost a decade of complete dominance by one team.
Mercedes have been nerfed plenty of times. They’ve just been good enough to deal with it. Ferrari were cheating for most of 2019, and all it did was make Mercedes even stronger.
Watching the video, I initially was very impressed that the industry came up with some almost-instant refuelling technique.
Less impressed now, after finding out that refuelling has not been a thing for over 10 years...