Rabbi Steinsaltz said:
Kosher-centered Judaism is a Judaism that tries to fashion two worlds – one of which is a small world in which you can feel Jewish through those things that are somehow obligations.
They have to be of a material nature -z – things that you can easily work at.
You can work at being kosher.
You can buy another pair of tefillin.
I think this is an unhealthy sign – being kosher is only a part of being Jewish, as anybody who has any interest in Judaism knows.
It becomes some kind of routine, and people deal with this aspect because they are not interested in anything really important about Judaism.
–Rabbi Adin Steinsaltz