I partially disagree that you need 90 C to break down connective tissue.
you can do this at much lower temps via SV , and thus keeping the muscle tissue from contracting
so much that the the meat itself ends up being dry by its self
and you can do it w low and slow cooking at lower temps , but it takes much longer to get the CT broken down.
but I under stand your point.
ive gotten extremely tender pork shoulder
by SV 130 F x 48 hr
then GE-IDS for 4 hours , 1 hour 200F ( from refrigerated temp of 36 F )
then 3 hours 180 F to a final internal temp of 140 F.
see above , and
https://forums.egullet.org/topic/166120-ge-profile-smart-indoor-smoker/page/6/#comment-2453570