As far as I understand it is an FAA recommendation to consider TA only. Original Airbus manuals state TA or TA/RA AS RQRD with a note on the FAA stance.
My employer does not go any further and the accepted practice is always TA+RA. Never had any problems with parallel runway operations (not always approaches) in FRA, MAD, BCN, BRU, AMS, LHR, FCO, LED, SVO, OTP, HEL, MAN, OSL, CDG ... However, the runway spacing is not very tight and there is little or none GA/VFR traffic, which I suppose may be the main reason to select TA only above 800 ft on approach.
FD (the un-real)