ROFR can be hit or miss. Offers you expect won’t go though do and vice-versa. The advice you received may have been based on limited data points.
Currently that seems to be the case, to a large degree, but floats at most other timeshares get harder to book certain times of year. I wonder how much more difficult it will become when more float units are sold and more existing float owners better learn the booking mechanics. What if the remaining float units are eventually purchased by the HPC trust and you have a bunch of people there all using those float weeks to book high demand weeks? Float units provide flexibility, but at a cost of a guaranteed reservation. I’d take the guarantee of a fixed week any day, knowing that if I want to move to a different week, I can rent my high demand week out, then use a HRC trader to do a CUP exchange on a week less in demand (or worse case, use the rental proceeds to book a rental).