That's not quite how it works. It's more like implementors (who make up most of the working group) create features, prefixed in a clear namespace e.g. -o, -web

That's not quite how it works. It's more like implementors (who make up most of the working group) create features, prefixed in a clear namespace e.g. -o, -webkit, -moz, etc. and then submit proposals for these features which are reviewed and reviewed, become standardized, and everyone implements the agreed upon solution. It is absolutely critical that these features go through this open process and are well documented. What you are describing is more akin to the Netscape - IE browser wars, which was terrible.