I try to remember here, it was a problem with the wing's aft spar and the flaps drive I believe, a problem that did not exist with later airplanes, not necessarily 200s but, (like PanAm) TWA had old airplanes... If 30 flaps was used it required an inspection...
At PanAm we favored 25 landings and many other airlines do... Unless other conditions requiring 30, I presently "recommend 25" as a suggestion, not a policy... Most pilots I fly with seem to agree with me... besides, there are other considerations: fuel burn reduction, and less noise...
What I did not like with TWA "block" for flaps 30, is that an airline deliberately decreases the alternatives left to the crews, who may be in need of that capability without restrictions, one day... I believe making a policy is a better alternative... i.e. "land with 25, but 30 is there if you need it"...