> they should have learned mussar.
They did learn mussar.
When pointing a particular mussar lesson during Daf Yomi, the Rav referred to a story of someone asking a shailah of R Salanter and getting an unusual Mussar response.
The person wondered – Kavod HaRav, where is this psak come from?
– From Gemora
– from Gemora? I did not see that [that is, person asking question knew whole SH’S – AAQ]
– It does say so in MY Gemora
So, you just need to learn with a particular eye
Specifically, in Shabbos Maariv, we have extra piyutim to make sure that the late-daveners (or long-daveners?) can finish and walk back home together with others.