There are always exceptions, but there's typically order of magnitude differences between globally doing "the right thing" vs "good enough" and going back to fix the few cases where "good enough" wasn't actually good enough.
If you are on a true green field project - your organization has never done this before good luck. Do the best you can but beware that you will regret a lot. Even if you have those long term employees you will do things you regret - just not as much.
It’s very difficult to get opportunities for growth. Most of the challenging work is given to the seniors, because it needs to be done as fast as possible, and it’s faster in the short term for them to do it than it would be for you to do with with their help.
It’s very difficult for anyone else to build credibility with stakeholders. The stakeholders always want a second opinion from the veterans, and don’t trust you to have already sought that opinion before proceeding, if you thought it was necessary to do so (no matter how many times you demonstrate that you do this). Even if the senior agrees with you, the stakeholder’s perception isn’t that you are competent, it’s that you were able to come to the right conclusion only because the senior has helped you.