1: I'm pretty sure you mean the clip whete he stands still in the middle of going uphill which I'm pretty sure was the Sega person deliberately stopping as seen with other similar clips shown off this week, like when he ran straight up a wall and stopped to climb for a second before running again.
Because Sonic fans don't know ****, they simply heard a youtuber say 'pinball physics' and 'momentum' and thought that sounded cool, see how Sonic 4 Episode 2 isn't highly praised despite fixing the wonky physics in Episode 1 or how Generations is easily considered one of the best games in the series despite Classic not being able to build up speed by rolling down slopes, or how Forces is considered absolute ****ing trash despite both Classic AND Modern being able to gain momentum when going downhill
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These troglodytes are deeply offended because they think roll down hill equals good design only to ignore how mediocre games also have roll down hill, they're so upset they never stopped to consider that maybe Sonic being able to stop on a dime was a deliberate decision so you could easily stop if you saw something when exploring instead of potentially running off a cliff because you were going to fast and have to climb all the way back up by running around the hill just to get back to the thing you saw and wanted to interact with, especially as Sonic seems to turn a hell of a lot more easily than in other Boost games and Quick Step being changed to a dodge roll suggesting the devs knew that going open world meant having to think of how to make Sonic go fast while making sure he can be controlled easily in this enviroment he's never been in before