WP can't be taken as the exact date for the team to fulfill all of their promises. It's almost happened in every project if the team was delaying the launch of the platform. This is only an example and WP didn't determine how sure they are to launching the product at the date that has already stated in WP
That's right, WP often only a guide for a project, but many projects are not in line with what they write on WP. I think a good project must really be in accordance with what they write on WP, if they deviate then many investors begin to doubt the success of the project. But I also think the Crypto project also needs time to succeed even though it's not in line with WP.