It does bother me. I think Shapiro, and/or a few others, would be much better overall options.
Your posting history leads me to where I don't believe, for 1 second, that you actually want Trump to face a good, formidable, competitor. He's faced two of the worst POTUS candidates in modern history, from either side, and he went 1-1, losing the popular vote decidedly both times. I don't think Trump, or you, want anything to do with an actual good candidate. Trump, historically, doesn't fare well when things actually get difficult. BKs, product failures, failed projects, his management of Covid, the 20 election, the various down ballot elections since he became President...He loses a lot. I honestly think if he were to lose again this year, that he'll try to run again in 28, and he'll have just as much support. Being a loser evidently hasn't hurt him with his base.
So, yes, I do agree that what seems like a Harris appointment, rather than a choice between her and a few others, is not a good idea. But the delegates were free to do what they want, they technically didn't HAVE to immediately pledge for Harris, like they did. Whether that was forced on them, or not, not sure. Seems like it probably was.
You're "pouting" because Trump no longer gets to run basically unopposed.