This is certainly a position I've found myself in, there's a temptation to talk about ideas you intend to do, but the ones I get progress on are ones where I actually execute on the concept, telling people later once I have something solid to show, or I already have someone engaged asking me about progress.

The current commentary might be a personality specific thing however, I've certainly seen people discuss ideas as a forcing mechanism to get them to work on them, and also people discussing ideas as a way to evaluate whether they're worth working on. I doubt it's very clear cut.