Two days ago I took off from BUR in relatively windy (although dry) conditions. Flightradar showed departure from runway 33, and winds were recorded roughly mid 20s kts from the N-NNE direction. Temperature was mild at mid-60s. The aircraft was a B739.
Prior to door closure, after everyone had been seated, the captain asked for two volunteers to take a different flight. His reasoning as explained to us involved a combination of the windy conditions and the length of the plane (not stated exactly as such, but in a nutshell involved these two factors). The crew did not specify a section of the aircraft that the volunteers needed to be from, nor did they reshuffle passengers after two volunteers left. It was a nearly full flight, but not overbooked as everyone was already seated.
My confusion is why a plane taking off into strong headwinds would require less weight, when headwinds theoretically reduce runway takeoff length requirements and make takeoff easier, generally speaking. Because the captain mentioned the length of the plane as a factor, and knowing that the 739 has some more significant tailstrike risks, my hypothesis is that the nose pitch and/or flap setting in windy conditions has something to do with it, but I can't fully understand why. Can anyone explain why two passengers needed to be removed?