Per deadline.com
"ABC’s Roseanne reboot delivered premiere demo ratings we haven’t seen on broadcast TV in awhile. The first of the two episodes drew massive 17.7 million viewers and a 4.9 rating in adults 18-49. The second episode at 8:30 PM rose even higher to 18.6 million viewers and a 5.3 in 18-49. For the 8 PM hour, Roseanne averaged a 5.1 in 18-49 and 18.2 million viewers." and "Roseanne scored the highest rated Tuesday entertainment telecast in 6 years among adults 18-49 and TV’s highest rated comedy telecast on any night in 3-1/2 years– since 9/22/14."
Oh ... that's why ... ::sigh::

