Basically it is a motorized indiaman.
Meh.
Basically it is a motorized indiaman.
Meh.
As another poster here, I also have a friend who has been able to sail on Götheborg once. The ship definitely have usable sails that are used most of the time. If I understand it correctly the motor is to some degree there as a modern safety requirement (and possibly it makes handling in port much easier, I would guess - don't know personally).
Square-rigged allowed for more sail. It also worked better for larger ships since had lots of little sails instead of one big one.
(Source: I have a friend who have worked/sailed the ship multiple times)
The Oosterschelde once rescued a single sailor from his boat that was sinking in the middle of the Atlantic (I wasn’t on that trip).
They used the engine for the rescue to minimize time and safely approach the small boat close enough to heave a line.
Doing all that under sail, like the OP seems to think they should, wouldn’t just be extremely difficult, it would be dangerous and profoundly irresponsible.
Modern sailboats (as in since 1900) have auxiliary engines for a reason…
However they surely had their reasons for not using sails.