I don't know if it is really realistic but for me it is more real with than without, a tanker can't accelerate like a rocket. And also i prefer with Tomsens tweak
I did not see big problems but i have not a lot of hour of gaming with it.
I think that in a "solo" encounter there is no problem; in a convoy perharps there is more confusion and some boats may be stopped but i also saw this behaviour in GWX3 "unmod" (or vanillia but i did play with it).
Also, i think it facilitates a bit shooting but for me it's good
Bye.