So you always have to have some means of power generation available for demand raises at any point and you have to be able to throttle down power generation in case of a demand drop, because otherwise the grid goes down equally as if you had not enough power capacity.
The good news is: renewables can be throttled down quickly, better than most other sources, the bad news is, you can only know about 3 days in advance what the maximum output of your renewables will be and there are days with very low total production. A future grid concept would have to come up with a solution for that. Gas would have been the easy way and probably will be the future when based on gas created via power2gas.
This is an incredible misunderstanding! Honestly, it's like saying that planet Earth is flat.
Did you meant something like "time zones are a social construct"? This true but quite a different claim that the one you made (which is not surprising since what you said is just nonsense).