An old steel bike can outrun a planned-obselesence avalanche. While all others are leaping from 105 to Ultegra and Di2 like rock climbers on a pitch of loose shale, you (and your bank account) are still and solid.
BONUS TIP: Do you see Luke Skywalker upgrading his light sabre between Star Wars and Return of the Jedi? No. (although, that's probably only because it wasn't an Apple product.)