Mature companies can't afford being as fast as startups simply because their different size causes 1) a completely different level of decision inertia, 2) a com

Mature companies can't afford being as fast as startups simply because their different size causes 1) a completely different level of decision inertia, 2) a completely different level of communication issues. You're not working with 0.1X colleagues, you're working at a 0.1X company. If that's too slow for you but acceptable for your manager, talk with them about it; in the best case, consider yourself free to spend the henceforth-saved time doing something else.