Why did Boeing keep using yokes while Airbus moved on to sidestick?
There are very good reasons to implement coupled column/yokes for aeroplane control: they are right in front of you, you can apply force with both hands, and you can feel immediately what input the other crew member is giving. The force sensors in our hands are very precise feedback instruments that should and can be fully utilised.

The upside of the side stick for passenger aircraft is...actually, what was the problem that needed to be solved? More room for the lunch table?

The F16 used side sticks because of the 9g accelerations that accelerate arms all over the place and can be the source of Pilot Induced Oscillations - best to support the arm with the armrest and control the aircraft by wrist movement. Not a lot of movement because the sticks are almost fixed, and use the force sensors in the hands for pilot feedback.

Column/yoke combinations provide the clearest feedback on what the condition of the aeroplane is: hydraulics ON, autopilot ON, trim position. The 737 is about the largest plane that can handle manual reversion, and one requires a column/yoke or a centre stick for that.