AFAIK Boeing only recommended NOT deselecting as often 737 was first jet type for turboprop operators so KISS...all manual or all auto.
If an operator had proper training on the benefits (alpha floor and G/A thrust with TOGA) and the negatives/times should be disconnected completely (gusty/swirly wind conditions with large airspeed fluctuations) then Boeing lets you fill your boots.
It IS only a recommendation, not a requirement and the FCTM only a reference guide - although a bloody good one and grossly under used IMHO - as opposed to company SOP's, whether stated or implied.
Personally additional protection (safety) for (say) 95% of the time Vs less protection (safety) for 100% of the time....know which I'd choose.
Cheers.