Question

I’m trying to understand the topic of the enactments and decrees of the Sages in two respects.

1. There are some very strange decrees (for example, that a woman should not walk in the marketplace with her child in front of her), with even stranger reasons given for them (“because of an incident that occurred”). So strange, in fact, that at this moment I don’t even remember whether the prohibition is to walk with the child in front of her or behind her.
2. There are decrees of the Sages that somehow got lost, and nobody even remembers them. Not just the issue of pairs, where it isn’t stated that they enacted anything, but it is obvious to the Talmud that this is the rule and it deals only with the details, examples, and so on. There are actual decrees that were enacted and simply disappeared. (I can’t remember examples at the moment, but at one point I made a long list of such things.)
3. This is besides the issue of how “lucky” commandments are, in the sense that even a positive Torah commandment can simply disappear and no longer be practiced (the prohibition of new grain, tefillin for many, many years—if I understood the plain meaning correctly. By the way, I’d be happy for a referral to something to read a bit about this matter of the neglect of the positive commandment of tefillin over centuries, at least from the time of the Talmud until Rabbi Moses of Coucy testified about himself that he brought many back from sin), for a reason that is itself rather strange (how did they even arrive at that???), and even today there are dolls in every Haredi home (yes, a few Briskers cut off noses. Come on, really). I mention this because maybe you once wrote about this too.
4. In short, I’d appreciate it if there is some kind of “index” to your writing.
5. Many thanks, and more power to you.