Or if you say we should slow down your competence is questioned by others who are going very fast (and likely making mistakes we won't find until later).
And there is an element of uncertainty. Am I just bad at using these new tools? To some degree probably, but does that mean I'm totally wrong and we should be going this fast?
There is a saying: slow is smooth and smooth is fast.
I have personally outpaced some of my more impatient colleagues by spending extra time up front setting up test harnesses, reading specifications, etcetera. When done judiciously it pays off in time scales of weeks or less.
And there is an element of uncertainty. Am I just bad at using these new tools? To some degree probably, but does that mean I'm totally wrong and we should be going this fast?