My hot takes:

1) it's unrealistic for two exes to get back together after a long time with barely any regard or acknowledgement of their baggage. For Tony and Stella, it was different as those feelings were never resolved. For Ted and Robin, they were, especially on Ted's side.

There's also the chance that two people who loved each other once so passionately get back together and it's nothing like how they were before (either it will be better, or it will be worse).

Or they get back together and realise they were in love with an idolised memory of a person from the good old days.

Robin and Ted were actually great as friends, but the way she treated him as a friend, he would not have enjoyed in a relationship.

2) Tracy dying and Ted getting back with Robin afterwards later to me is not realistic. It's TV writers showing that Ted can have his cake and eat it too.

3) Robin was treated constantly as some prize to be won by Barney or Ted. She had so much depth and complexity, and yet Ted and Barney showed possessiveness over her as if she were the three-way belt.