This is a common source of confusion for a ton of folks. Anyone can submit a patch, but commit bits are reserved for a much smaller list. The attitude is something like you commit it, you maintain it–so if bugs come in you'll spend your time fixing those for whatever time it takes vs. working on the next shiny feature that you're excited about for the next release.
There was sort of a fuzzy "major" contributors (https://www.postgresql.org/community/contributors/) which were people that contributed major features and then a list of other contributors. Depending on who you talk to this is either dated or a pretty close attempt at reflection of reality but not perfect. In recent years they expanded the contributors to include others that were contributing in non-code ways though it's still a decent place to find people contributing to major feature sets.
Of course this is not to be confused with the core team–which is more like a steering committee. But not so much steering committee of code and feature sets.
There was sort of a fuzzy "major" contributors (https://www.postgresql.org/community/contributors/) which were people that contributed major features and then a list of other contributors. Depending on who you talk to this is either dated or a pretty close attempt at reflection of reality but not perfect. In recent years they expanded the contributors to include others that were contributing in non-code ways though it's still a decent place to find people contributing to major feature sets.
Of course this is not to be confused with the core team–which is more like a steering committee. But not so much steering committee of code and feature sets.