Single pilot trs
I believe that the main reason all those jets don't have trust reverses is because they are designed for single pilot operations...
Removing the TRs reduces a big problem when it comes to rejected takeoff single piloted because of tr, just one less thing to think about/do.
I've been flying a S/II for around 4 years in and out 900m runways, the tr sure make a difference.
Also, aerodynamic barke (such as tr and liftdump on a hawker) is always better because you save brakes and you can really feel the difference on wet runways..
Imri