Sure, a tradeoff, but a moronic tradeoff.
That we literally already had a keeper is beyond all dispute. An upgradeable keeper, of course, but a keeper. We literally had no striker last season after Ronaldo left. And no, I don't want to hear about Martial or that Wout would have been good enough if given another season to prove himself. Going into the summer transfer window, someone upstairs made the decision to make our highest priority -- a striker -- a low priority. In the end we brought in a unproven striker with a fractured back that came to us so late, even if his back wasn't fractured, that he had no pre-season training under his new manager and with his new squad.
If we were to go back in time, knowing what we know, we would be fecking morons to do exactly the same thing that we have done, which was to bring in players for two positions that were not our top two priorities and to ignore, as of August 22, the two actual priorities -- CDM and ST. One could argue that Hojlund is proof that we didn't ignore the striker position, but it remains an undisputed fact that he has no experience in the PL and that his back is fractured.
If all goes as well as could possibly be hoped, Hojlund will be firing on all cylinders by December, by which time we'll be out of the running for the PL title and at best in a fight for top four. Perhaps that's the best we could have expected anyway this season and that Hojlund must be thought of as a long term answer. Great, let's all wait for the long term.