I talked about something like this in my comment. One solution I was thinking is that even if it's a parallel engine don't you still save on resources if some o

I talked about something like this in my comment. One solution I was thinking is that even if it's a parallel engine don't you still save on resources if some of the most popular sites use the simpler/faster layout because the memory/cpu overhead is significantly lighter on the new layout? And the bigger/popular website has a motivation to update if it's actually faster and more responsive.