Yes this trend of only looking at exchanges launching IEO will surely overlook the project itself. Nowadays, investors are in belief that IEOs launched on reputed exchanges are always good. But in fact, that is not the fact. Launching IEO is only a means of collecting funds to fund a crypto idea. The merit of a project should remain forever.
It has been like that, IEO is just an exchange approving the idea of a project making a crowdfunding from the masses through their platform. There's no such thing as 100% when it comes to investing.
Even all those exchanges are only approving based on the legitimacy of the project and NOT because it has a promising future for most of the cases.
People just need to realize that IEO can't live up to what people has hyped up in the past because it's basically ICO but having partnership with exchanges.