I have been on totally keyless for about 10 years now.
Started when I bought the TOS lathe new which must be 15 years ago now and gradually changed over.
I think the only keyed chuck is a monster 3/4" for odd jobs. Ironically the three that I ordered with the lathe, all genuine Jacobs have exploded and been replaced by imports which have held up better. IMHO the Jacobs had been heat treated too far and when they self tightened as keyless do, they just broke up.
Each lathe has 4, mills have 3 or 4 each, few on the drill so probably running about 17 or 18 pieces, all with no problems.