Yves Gelinas of Cape Horn fame also sailed around without an engine.

Much depends on your objectives. If you just want to go around, stopping at
the minimum number of ports for resupply, the space and weight of an engine
may well be better devoted to other things. It can make landfalls
nervewracking though with sleep deprivation due to higher traffic, light
winds, currents, and unfamiliar waters all piling up into a situation that
could be pretty dangerous. It nearly happened to Yves approaching Ireland.

A major objective of my cruising is to explore and photograph the shores
closely and extensively when I get there. This is often best and most
enjoyably done under power. I get plenty of sailing in on my cruises. This
is also the times, the wind often being light or non existant, when engine
failure could be most threatening to the boat. I plan to be doing a lot of
this close up to the cliffs in Newfoundland where it's too deep to anchor if
the engine quits.

--
Roger Long