Sure, but people will still rediscover things independently, unless they choose to read everything ever written before actually doing anything.
I don't think that blog posts (or any form of writing) needs to be restricted to sharing new information only. Writing can serve as a mechanism for demonstrating what you have learned to potential clients/customers... it can serve as a means of solidifying concepts in your own mind... it can serve as a journal to help you remember things you were thinking in the past.
We need a snappy name like "analysis paralysis" that is focused on people who spend all their time studying rather than doing. They (we) intend to do, but never fell like they know enough to start.
I don't think that blog posts (or any form of writing) needs to be restricted to sharing new information only. Writing can serve as a mechanism for demonstrating what you have learned to potential clients/customers... it can serve as a means of solidifying concepts in your own mind... it can serve as a journal to help you remember things you were thinking in the past.