My understanding is that Wellington returned to the battlefield in later years and was offended that it wasn’t the same. The sunken road that acted like a moat against the French cavalry had been filled in, using dirt from the edge of the hill that protected his men from the French Artillery.
If they restore the battlefield to its previous condition, it would be a service to History, and somewhere, Wellington would softly smile.
If they do it wrong Wellington would be upset that they put their foot in it.
That would be too bad for Wellington — Napoleon was used up in his Russian campaign (dropped nearly 500,000 on that campaign, absolutely mind-boggling), and his former cowed allies turned on him. If that hadn’t happened, Wellington wouldn’t have been able to join battle.