Pros: (1) it does not rely on a precise timer
(2(1) it is less dependent on ticks (expensive kern.hz on different platforms)boosts performance in LAN where packet loss is serious.
(2) it is less dependent on ticks (expensive kern.hz on different platforms).
(3) it has little negative impact in WAN where RTT > 10ms.
Cons:
not RFC8312 compliant