I agree with you, that usually projects that have a token that is deflationary is way more attractive to investors because if you buy now and more and more tokens get burnt over time than the tokens that you have are getting more and more valuable automatically. That is not always true in reality though obviously because if a project is bad and is not delivering then it also won't matter if their token is deflationary or not. It's price will still go down.
I recently bought some Cosmos even though their supply is also inflationary, but the project itself is just so attractive, at least to me, that i still bought some tokens. So far the price performance of Cosmos is pretty good, even though the token supply is inflationary.