Agreed, there is no "resurgence" in rim brake bikes. That doesn't mean that disc brake TT bikes are a better solution (they are not, IMO), just that the reality is that the industry has gone in a certain direction for better or worse.
There are lots of cases where the industry has moved forward with a new standard that was not optimal for TT bikes (or sometimes road bikes in general). Things like oversized fork steerers with large bearings, leading to fat headtubes.
TriRig is heavily invested the legacy standards (both the Omega brake and their rim-only frame offering), so it's natural that they will be advocates for them. As much as I like their products, there is no way if I had to get a new TT bike/wheels tomorrow (ex. theft or a bad crash) that I'd not go disc.
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