I think this is a difficult question, isn't it too big a risk to invest in projects that are just being developed?
Almost all on this cryptocurrency projects are being developed. For example fork, fixing things, maximize anything, working on roadmap etc. We can't say that project is already stable if they are still working on something. Hence why it's called it's still on development. You are free to invest on that, but just make sure that they are on the right scene instead of just fake roadmap etc etc.
What do you think about this issue? Do you invest in young and just starting projects?
Back in 2017-2018 people are really hype about ICO because of promising new projects and some of them were having a great progress, so it's okay to invest on those if you know the risk.