You apply first principles thinking, but also be mindful of your role in the team.

When you say something isn't warranted because it takes too much time, it isn't valuable: you're still thinking about what it is you're doing (working), what tools you have (your team, people), to create value (your product or service).

It's the measurement of value part that's tricky. Who determines value? Sometimes it's the customer, sometimes it's just you.

It's about perspective, and seeing where you fit in the picture. Apply the principles from there. Nobody says you have to be a jerk about it, that's up to you and how you wish to apply the output of the first principled thinking.