Is this a serious question?
A) when sailing in or out of a marina or port, the largest vessel is the stand on vessel ("constrained by draft or maneuverability") whether YOU are under sail or not, PERIOD.
B) most marinas will not allow you to sail in or out, especially if it is a crowded, busy one.
C) I'm not sure you can even get insurance on an unpowered vessel these days.
D) If you sail into a crowded anchorage where I'm anchored, I will think you a fool, not respect your sailing skills. Prudently, you must anchor outside all the other boats, which puts you farther from shore; does your dink have power or do you row?
E) What would you do if you were dragging through a crowded anchorage in a 40 knot squall without a motor? How would you even get your anchor up to get underway?
If you've sailed enough, you've HAD to sail into somewhere you wish you didn't have to, hopefully only once.
We sail off the anchor or mooring almost always (when the bareboaters don't anchor too close), but the engine is always running unless there are no boats around us. We sail up to the anchorage, but power the last few hundred feet or so.
I know that Nikki & I are capable of sailing this boat anywhere, in almost any conditions, but we are conservative sailors & would NEVER think of doing anything which might lead us to damage someone elses boat.
Yes, they are noisy, dirty & somewhat expensive to operate & maintain, but they are also the cheapest & most convenient insurance you can have on a small vessel.
F) What's the point in an unpowered cruising sailboat today?