Why did Google Chrome stop launching a separate process for each tab?

Question

Google Chrome

Hello. The whole point of the question is in the title. I know that many spat on eating RAM, but for machines that have this very memory with plenty, the situation was more than advantageous.
Now I see how n processes are running, each for one extension, plus m processes for all open tabs, and m is much less than the number of these same tabs.
At first I thought that one process is allocated for each "window". At first, such a picture was observed. However, this assumption turned out to be incorrect. Sometimes it happened that windows 3-4 were open, and there were only 2 processes for them.
What's the matter? Why did they decide to abandon the good old memory-eating policy? Is there a way to enable this "working mode" without rolling back to the old version?
I complain that one processor core is simply not able to withstand the simultaneous loading of 10+ video tabs, while the entire processor coped with it.