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Boards can certainly get flexier and flatter for instance. Take a standard camber board with plenty of use over many years it'll get closer to flat. Less pop etc but it would take some time and use for a super stiff board to ever become super flexi if ya know what I mean.
Having said that, most people will use a board a couple of weeks a year? So, with answers to a few questions you can work out whats what.
I am lucky enough to only have done seasons and when you're using a board 5 times a week for 5 months its easier to see that change. I did 6 seasons in a row and only had 3 boards of my own.
Unlike bikes I was very much run what ya brung. (K2 Ultradream for everything in the end)
Which raises a question, can a board be changed over time? If it was once a stiff board cause of “internal rods”, can the stiffness or characteristics of the board change? Is there a risk outside the obvious inherent risk when buying an older board? Or is a board a board and the sales tech speak just mumbo?