That was the regimen of the Old Litvaks. The Yeshivaliet adapted. (In some non halachic ways as well.) I thought this was known.
When Chabad adapts everything goes bust. So they hold on tightly.
Kol hakavod. What’s the problem that Chabad is so tenacious about their minhagim? We could find these follies everywhere. Is it because Chabad minhagim are strange to us?