If it couldn’t fail, you lost an opportunity to learn.
Researching a topic is a good way to learn a little bit. Hosting an event about the topic is a good way to learn a lot.
Most of the time our energy is spent doing activities where we can only learn little bits: googling, writing a draft, rehearsing in our mind. In order to learn a lot, you have to take action. Action is scary precisely because you could fail. But action is where the learning leaps come from.
Publishing the blog post, doing an in person customer interview, launching a website. All these experiences provide an order of magnitude more learning than their fail-proof alternatives.