I understand your frustration because I work in a large company and stuff can take forever. And this is the case for 99.9% of large companies.

However one thing you should consider is this: there are probably 50 other people like you demanding to just have feature xy implemented. They are all totally simple etc.. until you have seen a large enterprise code base with lots of legacy cruft. Test suites that take hours to run..

And then the team has to fix bugs that also pile up. Every fix makes the code base uglier.

And then people come along and want direct access to your repository to "help".

You see where I am going?

Long story short: it's not as simple as you think it is. If it really bothers you that much and you cannot understand "the other side", you should probably find another startup to work at. And I am not snarky.. this is my honest recommendation.