BTS full albums used to have 12 tracks, so sure they don't have MV to all tracks but they always released many MVs, as well as performances to side tracks.
Considering I not only own 6 BTS albums, a lighstick and actually went to their concerts I believe I'm qualified enough to discuss their career and say for sure investing on their side tracks is one of the reasons why they got so popular
Please list any BTS 12-track album where they released anywhere close to 6 MVs? Performances are not the same thing lmao, almost every popular group will perform a couple bside tracks even on music shows.