I thought eldar jetbikes were 18 points each
17 points.
Also, taking squads in consideration, the min. Squad of CSM bikes clocks in at 19 points higher than the windrider min. Squad (which is more than one additional windrider, or 2 scatter lasers)
Your table also shows that they are exactly as survivable as a Tac marine (and nobody would argue "they die soooo fast"). Further movementspeed is a huge factor for survivability - not only the jetbike move, but the 36" turboboost to get out of harms way, the Jetbike per se to get OVER terrain if you want to hide behind and not THROUGH.
Last but not least there is a lot more weapons and tbh most weapons pointed at mobile 3+ units tend to have a high S and low AP. Plasma (which is pretty common) is a big equalizer here, same as Grav and while Ork bikers seem to live longer in the world of tables, they tend to get targeted by Autocannons, Assault Cannons, Scatter lasers,.... a lot.