No. When the belts get changed they should also be changing the tensioner bearings as well as the water pump bearing. What matters most is when it was last done.
The Ferrari manual doesn't mention changing tensioner bearings or the water pump bearing and, as far as I am aware, in the UK those will not be changed as a matter of course as part of the cambelt service. Hopefully though they will be checked for wear and replaced if there is any doubt. There isn't a problem buying a car that hasn't had frequent belt changes - if a belt didn't break it doesn't matter how long it was in the car before being changed.
Yeah the shop manual doesn't have A LOT of things listed in it. Like no where in the manual does it give to the spacing spec for the belt guide that rides just above the inner cams over the timing belt. Just an illustration of the guide resting on the cam belt. You do NOT want that guide resting on the belt as it causes wear. In a discussion on the matter we came to the conclusions that you should have at least 1mm of clearance between the belt and the guide. That guide is only supposed to help with belt slap upon deceleration. Is that pointed out anyway where in the manual? Noooooooooooooooooo. So just because the manual doesn't list it doesn't mean it shouldn't be changed. Keep in mind that the first 348's to roll off the assembly line are now 20 years old. So if you are running with 20 year old bearings on your car = not a good thing. If any of those bearings fail your belt & engine are toast. Change the bearings along with the belt.
