Re: a fair bit of rework to reuse
SpaceX have said the first one cost substantially less than half the price of a new booster. Presumably later boosters were quicker as they got more experience, and the forthcoming Block 5 is said to incorporate lessons learned and is cheaper still. As far as we can tell, being able to land the rocket is already important. SpaceX don't pass much of the savings onto customers, though. Customers and insurance companies seem to accept that reliability of pre-loved boosters is the same or better as new ones.
Using parachutes means splashing down in the sea, which exposes the rocket to salty water, which is highly corrosive, which ruins reuse.