Every Taylor chanter that I've heard and played has been fantastic. I'd say they're better than any of the modern 'modified Rowsome' chanters in terms of expression, tone, triplets, playability, etc. Just listen to Patsy Touhey or Sean McKiernan, or Fionnan MacGabhann for a younger player on a Taylor chanter.
The Rowsomes most certainly copied from the Taylors. I don't own a Taylor chanter but I do have an old Taylor long block copy on hand to illustrate the point.
https://imgur.com/a/kZXAm7cAn early Leo on the right. These two chanters are very similar, both 14 inch, same singing back D, same hole placement, same dimensions aside from the oval F hole (which was common on T chanters). The sound is surprisingly similar too with the same reed, but the bore in the Leo is a little more open.
Leo lengthened the chanters, added a rush and widened the holes over time, but you can definitely see where he was coming from here. The modifications Leo made at the start are surprisingly minute. Both Leo and Willie advertised as repairing pipes, so it's not out of the question that they'd have seen a Taylor set or two pass through their workshop.
I love seeing Taylor stuff make its way into contemporary pipe making, with DMQ and Chris Bayley flying the Taylor flag for decades, and newer makers like Andy May and Eoin O'Riabhaigh adopting aspects of the big Ts into their sets.