The advantages our 47 foot boat has over a typical 40 foot yacht are:
Room to pull up and store in seconds an RIB dinghy on the stern
Greater fuel, water, supplies, spare parts and toys storage
More room. A workshop. A walk around Queen size bed with standing head room
More stability at anchor
None of these advantages are necessary, but are nice to have.
The only real drawback is greater cost.
If you visit marinas a lot (we don't ) a bow thruster solves the problem
If the weakest crew member struggles with the sail area in an emergency solo (my wife can manage OK), then set less sail area. On a passage, a 47 foot yacht setting the sail area of a 40 foot yacht is likely to have similar passage times and will be easier to handle.
But if I could only afford a 30 foot yacht you would still find me cruising.