How is a Bitcoin upgrade being coordinated when Satoshi Nakamoto is not around?

I was wondering this the other day and it might be a strange question but who is coordinating an upgrade to the Bitcoin network with the absence of Satoshi Nakamoto?

We recently had a successful live upgrade of the Taproot protocol to Bitcoin for example. Taproot is an upgrade to the Bitcoin blockchain network which will preserve more privacy, efficiency, less fees and was the biggest upgrade done since 4 years.

Who leads such a project or upgrade into the right corridors and plans the dates of these tasks to be executed successfully? This is somewhat still a mystery to me since I’m not sure how or by whom this is being done with the man or entity who built the Bitcoin blockchain in the first place not being around us at the moment.