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Sure you'll see them. FJ40 owners from day one have always added (and continue to this day to add) all kinds of things to "improve" Toyota's factory design.
Now people who want a factory specified FJ40 have to either spend considerable time and money undoing previous owner modifications or search (frequently in vain) for the very rare, very elusive unmodified original specimen of any vintage.
Disc brake conversions are a perfect example of a modification that has become so "normalized" that many members here will scoff at owners who choose to stay with their drums. And the list of "must-have" modifications goes on . . . and on.