I think their way of going about it was wrong along with their logic. People didn't use the S-Pen because the S24 was the first time you could really use it.
Glass screen protectors were limited and many went to film/TPU which the pen scratched (myself included) (edit; prior to the S24 U). So their "data of nobody using it" is a bad metric on that merit alone. Then there's the assumption that based on the data removing it means it affects nobody, including those that love(d) it.
The first step should have been wait another generation. In that generation allow user control of the BT functionality by controlling if/when the capacitor charges the pen. Gather data on that.
Lastly, in a less controversial but still not popular decision, make the BT version a purchasable accessory at a reasonable price. Those that don't care about the pen won't be affected. Those that really care will buy it. Those too stubborn will cry and switch but will be a minority.
But that's all oughta, coulda, shoulda.
That said I'm going to say this (again, for those that saw it already). DO NOT go jamming your existing spen into the new phone. The S23 Ultra pen looked identical and went smoothly into the S24 Ultra and for many was semi-permanent without a pricey Samsung repair, a few lucky folks were a le to pry it out. So my don't be that person.