Rules that were true old Overwatch but not in modern Overwatch?

I've noticed some changes in beliefs from the community. I noticed 3 major changes. And I'd like to know if there are lots of other ones you all noticed too?

#1 - In the early days, vod reviewers would focus on mistake aversion, like avoiding deaths. If you die or lose the team fight, you look at it in retrospect. Nowadays, coaches put more emphasis on staging at the start of the fight. What's the plan for you to win the fight? How will this plan play out on this map with the enemy team comp?

#2 - I feel like people had a more static view of Ultimates. You gotta save your Ult for the enemy Ults (don't "solo ult"). Save your Ult for the point fight. Nowadays, I feel like a lot of people value tempo. If using your Ult means an ally lives or an enemy dies, that means it's easier for you to get your next kill and snowball.

#3 - I think "lane theory" is more dynamic. In the early days, there was the mid fight and you could flank left or right. Nowadays, more people on all different roles are rotating and taking offangles. The flank routes are literally whichever parts of the map are unoccupied, and that varies on a second to second basis. The fight doesn't always happen around the middle of the map, you rotate according to where everyone else is rotating.

#4 - Tanks are stronger. I feel like in old Overwatch it was encouraged to kill squishies over tanks because it can be done more quickly. Nowadays it's a delicate balance. Killing squishies is still valuable, but at the same time, if you contribute nothing to the tank trade and your tank is routed, it's a significant disadvantage.