I was discussing the subject of tefillin with my father motzei-Shabbat and particular, the battim (leather boxes that contain the parshiyot, or parchment scrolls). We ended up wondering what the mid-to-late 20th century Acharonim, in particular those with a more "modern-Orthodox" background, preferred in regards to the use of tefillin peshutim in the modern era, when better forms of battim are available. We also wondered on the opinion of R' Moshe Feinstein זצ”ל, as his teshuvot are often used as a yardstick to measure others.
Modern- and Neo-Orthoodox opinions (if they exist):
- The Rav זצ”ל
- R' Amital זצ”ל
- R' Michael Melchior שליט”א
- R' Aharon Lichtenstein זצ”ל
- R' Norman Lamm שליט”א
- R' Teitz (rabbinic family from Elizabeth, R' Pinchas, זצ”ל or R' Elazar Mayer, שליט”א in particular)
- R' Josef Breuer זצ”ל, rav of KAJ/Washington Heights and former head of the Frankfurt Realschüle