Active telegram group is better than not at all. When the team of the project actively engage with community, you will know every updates they deliver on that group. As investors of the project, it is important to keep updated about what you invest on.
It is not about the price, it is about whats going on the project like, coin listing, coin swap, etc.
Yes, that's right, things like coin lists and coin exchanges are very important to be known by everyone involved in the project, not only investors, and that will clearly be notified by the project team into their community group, namely at telegram.