How to persuade your tech and product team to prioritize event tracking and data analytic works?

Hi all
I'm doing product marketing in a small startup with 50 people. We're just starting up these days, having only few users. We're using Segment + Amplitude for analytics, but we only have very few events tracking set up.

Product managers and the tech team told me that the work of setting up more event tracking will only be considered when there're more users. They'll put more effort in developing new functions for now.

So the real questions here:

1. In most cases, how hard is it to set up event tracking with Segment?
2. How many users should one has to be considered enough for setting up a more comprehensive event tracking analytics?

I'd like to hear your experience
Really appreciate that, thanks :)