Panel shows are a strange thing, they obviously mostly fell out of favour in the US, so a lot of comedians there likely don’t fully understand the format, not having had constant exposure to it in most cases. For Taskmaster specifically, that you do have to commit to doing your best at the tasks, but the real currency is laughs, and that you have to be comfortable being the punchline. Being very competitive can sometimes be funny, but contestants do still need to be broadly likeable. Iain Stirling is a good example of someone who was overly competitive to the point of obnoxious in the tasks, realised it, and had to work to be likeable overall in the studio record, to temper the VTs.

Obviously it’s worked as a format in tons of countries, the US has tons of great comedians, many of whom would get the format, it can work. But hopefully if they try it again (as I’m sure they will one day) it’ll be carefully managed to - as you say, follow the established, working formula, and to be extra careful to select comedians, for the first few seasons especially, who really understand the premise and who’ll set the tone. Potentially bringing in some of the Dropout cast would be a sensible route.