I think the reason that there's still some reticence from some fans and that this isn't a done deal is that it's the metrics that actually say otherwise. The metrics tell us that Carrick isn't doing as well as our results would suggest.
I'm no fan of XG and would rather follow the eye test, but someone in another thread mentioned that his XG is considerably worse than Amorim's (I googled, he's right) and Amorim was quite literally the worst manager we've ever had. I love Carrick and I love what joy he's brought me this season (and not for a moment am I comparing him to Amorim ... I'd take the latter any day of the week and would like to erase Amorim from memory), but football needs more than just feelings and emotion.
There’s clearly been something — some ineffable quality, whether it’s Carrick himself, variance or dumb luck — that’s allowed United to outperform what the underlying numbers suggest should be happening. But that kind of overperformance isn’t something you can sustain indefinitely. Statistically, everything drifts back toward its baseline. It’s like hitting black five times in a row on a roulette wheel — you don't immediately assume that you're going to roll black for the next five times and that's what we're hoping by betting on Carrick. The only way to know whether Carrick is the exception or whether this is just a hot streak is to keep going… which is exactly what makes giving him the job such a risk.
But, I'm playing devil's advocate. Because I really, really want to believe that he can do it. While logic is nudging my shoulder and telling me not to get too excited.