PAA: Everyone agrees that according to the Maskana of the Gemara and most Rishonim women can wear Tefillin. The objection is based on the Minhag quoted in the Rama that developed either during or after the time of the Gemara. MiDina DiGemara it’s Muttar. But the very strong Minhag is to be Oser. That is what these people (let’s call them neo-Conservatives) are missing. It’s not Halachic because they think they can ignore the Halachic process and re-read the Sugya against the Rama and all the Achronim.
Softwords: That’s not a good answer for Michal because it assumes Darshinan Taama Dikra. We’re not Doresh Taama Dikra like that.