The 200 kbps data rate covers the majority of industrial fieldbus links (Modbus RTU, Profibus DP at lower speeds) and leaves headroom for cable lengths beyond 100 m where signal integrity limits the usable baud rate. The 30 mV receiver hysteresis cleans up slow edges on long or lightly loaded buses, reducing the chance of chatter when the bus idles.
The 30 mV hysteresis on the receiver means the part handles cable lengths where reflections eat into the differential signal; you get a clean logic output even with a few hundred metres of twisted pair.
ROHS3 compliant per the listing.