The problem in using AI often comes from the social cognition of what's AI-generated (meaning it's constantly shifting & morphing as time move on).
On one side, you'll find individuals who make a living (or want to make a living) as well as purists who want to maintain a certain level of professionalism and, on the other, you'll find those who mostly benefits from it. It's nothing new in terms of principle of conflicts. For example, did you know that Photoshop on its own has cut around 22 full time jobs in the printing and design industry that were prominent in the early 80's into a single job the may even be part time? Do you see, today, people who complain about Photoshop having taken down all those jobs?
Kinda like how, today, quite a few individuals uses AI to generate content without the skills or knowledge to actually do something decent (hence it always seems wrong one way or another), you had that exact same principle back around 2000-2010 where the web took off and you would see people who (think they) know Photoshop and were calling themself professional graphic designer publicly when they can't even do 1/10 of the actual job. (I'll always remember when I, as a certified graphic designer, had to work with someone who promoted himself as a professional graphic designer, but yet didn't knew anything about DPI, PPI, CMYK or Pantones and yet he had to produce something to be printed in 2 colors at a press and was completely lost.)
The problem isn't about just using AI or not, but about if you can actually use AI properly or not. Today at least, if you use 99.99% of whatever an AI regurgitate from your prompt as-is, you're not using AI properly and, hence, you'll most likely be hit by whatever you have missed or didn't do properly way harder than anything else.
Take for example any games that made use of AI that was hit hard for it. What made people complain about the use of AI? It wasn't the fact that AI was used, but the fact that there was clear garbage left from when an AI was used and someone didn't do his/her job at cleaning things up. Even more when you're charged almost a hundred dollar for the product, that's as bad.
If you think that you can controls & correct whatever AI regurgitates at you in the few days available for a DevJam, go for it! It's only a tool after all. But like if you were to make typos (written mistakes) any mistake made by the AI that aren't fixed will be like a slap in the face of whoever tries your game later and that will bite you back way more than if you were, from the start, doing something that is clearly coming 100% from you.