[tevake]

Why go faster? You don't have to if you want to just cruise along. But with the capibility you can out run approaching weather, push thru tide flows. Expand your cruising range in a given time. Make that harbor before dark etc.
Or just putt along with greater fuel economy when not needing to push. It's nice and and can add a safety buffer to have the extra speed at hand.

I think the ability to expand the cruising area if running from a given point for many years is one of the best uses.

Also the displacement type hulls are often a bit rolly at anchor in less than smooth conditions.

None of these are totally compelling issues , just points to consider when shopping around.

Cheers Richard