Is the mantra that applies.
To the building. The real one!
The same does not necessary apply to the digital representation of the building.
In fact, trying to do a perfect model at first attempt (that will not change down the line) can seriously backfire on the model-authors.
Novice modellers and those that design projects around digital models for the first time all tend to want to do things only once. The thought of a model being dumped, replaced even lost terrifies them.
Maybe because of the effort that is needed to produce their first creation feels overwhelmingly large, they often insist in keeping half-baked formations and work on them well beyond used-by-dates.
You’ve got to learn to let it go. Start from scratch. Repurpose, rebuild.
Think of the screen as the digital sketch (butter) paper, you regularly screw up and throw away.
Or a word processor where entire paragraphs can be scratched and rebuilt.
In the olden days when software and hardware were much less reliable, there was the helping hand of a good old crash every now and again.
Redoing a model or any part of it has two benefits:
the model will be better next time, (you’ll find new issues with it, or the building it is supposed to represent that you’d missed so far)
and your modelling/model management skills will improve.