Again, not saying I think Holliday isn’t an upgrade over Brogdon. But if your point is that it is Holliday’s first season on the Celtics. It was also Brogdon’s first season on the Celtics. Holliday has not played like an All-Star for the Celtics this season. He has been a very efficient and solid player, but not even better than Derrick White.
I view Holliday as an excellent player. But he is not indispensable. It is debatable if that was the best possible trade of those assets. It was a good trade. Just maybe not the best trade.
What was out there that was better? There is always a better imaginary trade to be had.
I listed some examples above. For example, we probably could have traded RWill and the GSW First and gotten PJ Washington (he was traded for Grant and a first). That would mean the team would have Brogdon + PJ Washington vs Holiday. We also traded a 2029 first for Holiday so we would still have that to use in trade.
I am not saying it was a bad trade to get Holiday. It was a good trade. It made the team better. This all started with some posts hypothesizing on if we had kept Smart by having the Porzingis for Brogdon trade actually happen. I feel the Smart - Porzingis trade is a no brainer, at the time and based on how it played out. The Holiday trade is debatable. We probably don't trade Smart for Holiday if the Brogdon - Porzingis trade had happened, I don't know.
Brogdon has played well. He is a good player. Not as good as Holiday, but their play this season isn't that far off. We gave up a lot to get Holiday, don't kid yourself. It is an upgrade but was it worth the cost (both actual cost and opportunity cost of what other trade may have been possible)? I think that is debatable. I think most people discount the opportunity cost aspect of this. We could have had RWill's contract and 2 firsts to trade with and add to Brogdon.