Wingnut, to each their own, obviously. What I'm trying to say is that lack of flexibility should not be an excuse to not ride an efficient position, because it can be trained just like other fitness aspects. And efficiency obviously is the sweet spot of comfort, power and aero.
Just curious - what is your age, and what is your purpose for cycling. This isn't an argumentative question.
Because, if you're young-ish and/or with the purpose of going as fast as possible or competing, I can see why you might have a different view of the efficiency sweet spot and the value and purpose of putting effort into flexibility training compared to someone who is either older, or lacks natural flexibility or simply wants to ride a lot for simple enjoyment.
Note, I'm not saying I disagree with your general statement, but don't assume that people are making excuses for their lack of flexibility. Maybe they just aren't flexible due to natural limitations, age, or just don't feel it increases their enjoyment of the ride or benefits the reason they ride.
Having frame options for less saddle-bar drop is not because people are too lazy to fit themselves into racier frames. They exist because people actually need them or at least want them.
Now, if you'd said "a lot of people could really benefit and make their cycling more efficient by working on their flexibility" rather than "lack of flexibility should not be an excuse to not ride an efficient position", we wouldn't disagree at all. Hope that makes sense.