Honestly a better in my opinion idea would be to remove the ability to change servers on the client side. Dedicate some resources to better understanding the server errors in play now and get a stable server farm that actually functions. I play in the midwest US, and sometimes play with friends in England and France. We collectively stay on our own servers and I don't see them nor do they see me rubberbanding across the screen. Yet I play with someone in Oregon and sometimes I swear it is like watching an infinite wraith portal they move erraticly and somethings just seem off.
While in theory I do like the idea of ping matchmaking, when and where would the line be drawn? You hear now of people in diamond and predator lobbies in Australia not being able to get games. What happens to outlier countries and player bases when they are stuck playing against the same 60 or so players over and over. Just food for thought. I am not against it, just seeing the bigger picture of what I have seen in game and on the forums.
As far as testing high ping, I have tried changing servers a few times to high ping and no way would I say it is an advantage. Audio cues completely gone teammates and enemies teleporting around you. Not really an advantage in my book at all. If all 3 of your teammates went to high ping you would have no way to test it's effect unless there was an active kill cam so you could see what the enemy sees.
Bottom line on ping is the fact that it is higher in this game than any other I play an has not come down since launch. I would say one of the best implements at this point for UI they could do was offer an in game hud of actual ping rate. Fortnite had/has this and it makes it easy when recording fights to see if ping was playing a part in why you lost a certain battle or not.
I can't speak for anyone else, but I am getting sick of hearing shots landing seeing the splash effect of a hit marker yet no damage numbers only to leave a game and see 3 out of 10 shots hit.
All in all if this gets an implement in the future I hope they lock out the ability to change servers manually. Just saying.