Hello square leg, most of the time it is correct that the information available at the Jeppesen and other providers are enough for deciding whether an airport is suitable or not for a certain type, it is just those times when there is not enough information on a destination airport, or the R/W or airport was designed up to a certain type but can still accommodate larger types, here where a pilot need to put an extra effort to make sure he will not have any surprises. Pilots can reduce weights to comply with a PCN for a certain runway but can't make sure that they have enough wing tip clearance or wide enough taxiways unless they take the extra effort of consulting more resources. Thank you for being a useful resource.