I see it more as the difference between operating TAGHeuer as an independent company versus as part of a conglomerate.
You must remember that when JCBabin was pushing the HH watches, TAGHeuer was still pretty much an independent brand under the lvmh umbrella, as opposed to being an integrated part of a group.
The back end merger with Zenith happened later and hublot didn't join LVMH Swiss Manufacturers until a few years after that.
If the brands were viewed as individuals as they were before then TAGHeuer being the volume seller having a series of halo products, works. But if you see the brands are being branches of the same tree, then what fruit is on what branch naturally changes.
It's kinda obvious how JCBiswatch likes to run things...
Given the current climate, I think it's not a bad method as it sets clear differences between the products offered, minimises internal competition and reduces costs as fewer competing products are put through development.
The thing I'm not sold on, is the design path, which is where my comments about
Zenith watches being TAGHeuer watches in style.