I only can say, that a SW for managing complex projects is still required. Like Project Online.
Microsoft is only promoting Project for the Web since a while. But it has a complete other user focus. In the case Project for the Web should be a subsequent replacement for Project Online, it really needs a huge and quick development has to be done here. I understand it as a Project Mangaement tool "for everyone".
Furthermore dividing several parts of one product into different platforms is not user friendly
E.g. Roadmap functionality of Project Online is on PowerPlatform, not on E365. Therefore we can't use it.
Why? Because we not just use what you SELL. In my company we have many processes to be conducted upfront any of the services can be used seriously.
I don't like this sliced approach looking forward for a long lasting support on Project Online.