this would be true if all the time it takes for a pitch to reach maturity was actually spent refining the design and goals, but this isn’t true at all. most pitches go through long periods of time where they simply get lost at sea and forgotten until they wash ashore some months later. some, like the namespaces pitch (which i think everyone believes is sorely needed) never do get found at all. the @compilerevaluable pitch has been effectively dead since last year.
no revision is taking place while the pitch is lost at sea. no problems are being solved, and no designs are being improved, because the idea in its entirety has fallen through the cracks. to use the recently-ressurected character literals proposal as an example, it has not changed significantly in design since first proposed, and out of the year it has taken to reach review, perhaps only three weeks of that was actually spent actively working on the feature.
you’re acting like the evolution process shouldn’t be made more focused and timely because the time currently being spent is being well-spent, but it’s not. the vast majority of the time is being wasted because of disorganization and lack of direction.