Peculiarities of paint

Question:

If you build a house, when would you paint the interior (walls and ceiling): before installing the floors, cabinets, baseboards, and trims or after?

I think I would paint first, do everything else, and after everything is done, touch up paint where needed. My contractor prefers to paint last. It seemed a bit odd to me, so I did a bit or research and it looks like while majority of contractors prefer the paint first approach, some choose to paint last. Assuming that the painter knows what to do, there should be little, if any, difference.

So, the interior paint job was postponed, but in February, the exterior of the house got a fresh coat of paint.

Despite our best effort to get the colors match the original house, they were a bit off. The walls got slightly lighter and the accents turned a bit more brownish than the original. I will need to re-paint my original house pretty soon, so maybe will take a chance to consolidate the colors then, or just leave it as-is (the discrepancy doesn't bother me much).

Speaking of paint, I pretty much gave up the hope of choosing the right colors. No mater what it is (walls, floors, doors), no matter how much I try (use samples, visualize in apps), the colors always end up different from what I expected. Not terrible, but not as planned. Some turn up darker, some lighter. But never as expected. No pinkish hue, if you know what I mean.

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