Adaptive TCP optimization - how to understand?

I suppose there are at least three reasons;

1) The profile defines the initial options which would hopefully be tuned well for the majority of clients

2) MSS, Windows Scale and SACK can only be specified during initial connection setup and thus, you would want to set these to an optimal value based on your needs

3) The profile obviously allows you to enable or disable some features and settings and this ensures the adaptive optimisation does/does not make use of them; you are given control of what is or is not used