It sounds like you have certain minimum standards you expect of the people you're going to be working with if you're going to accept the job.
This is perfectly fine and normal, indeed it's a good thing. The very point of an interview process is not just to verify that you match their requirements, but also to verify they match yours.
That being said, how you go about assessing the latter is critical. There's an accepted dynamic in most interview processes that you're the one under assessment, and deviating from this too much will be perceived as weird and put your application at risk. You therefore have to be careful about how you approach it.
The best opportunity for you to assess them is during the face-to-face interview, which is already usually conversational in nature and during which most of the time there is a section where you are explicitly invited to ask questions.
Unfortunately, that opportunity has gone and you've only managed to leave with an impression of what you wanted to know. Putting it plainly, yes it absolutely will be weird (and insulting) to now start challenging the interviewers with the very take-home task they they've asked you to complete, and doing this will very likely cost you the job offer.
Some possible good news though: I've never heard of an interview process where a take-home task was the final stage. It's likely you'll get another opportunity later to have further conversations with your future colleagues and make this assessment in a better way.
If I were you, unless you absolutely trust your gut, I would just ignore your first impressions and continue with the process in the hope that this happens. Also learn from this, and spend some time thinking about how next time you're going to properly assess the requirements you have in an interview process right from the start.