A piece of furniture is not finished when it leaves the workshop.
Wood keeps reacting to the room it lives in.
Oak slowly warms and darkens in daylight. Walnut goes the other way and turns lighter, more golden. Cherry deepens a lot in the first months.
So the sample you approve under showroom lights is not the colour you will live with in three years.
This matters most in rooms with big south or west facing windows. A table by the window and a cabinet in the darker corner can slowly drift apart, even if they were made from the same boards.
Humidity does its part too. Solid wood moves a little with the seasons. Good joinery leaves room for that. Bad joinery fights it, and then you see the cracks.
None of this is a problem. It is the reason solid wood feels alive.
It just means the right question is not only "do we like this finish?"
It is "how will this look in this room, in this light, five years from now?"
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