What’s your point? The flow difference between a nickle plated copper (which is what the bondtech is) and brass + copper insert is going to be negligible given the same design.
These are probably the same as the others. Triangle lab doesn’t make everything they sell. The parts you see that are sold by others are going to be identical.
The point is it is easy to design a nozzle/hotend that does well for 500hrs, but it’s hard to design a nozzle that does well for 2000hrs and beyond. Some even start to have issues as soon as you actually start to use them instead of just doing all sorts of testing. E.g., it’s easy to cheat to have a better flow, but it’s very hard to manage the pressure and retraction. Which is where many knockoffs do very bad.
A bit of a tangent, but I imagine you all may find this interesting:
I’m able to get 40mm^3/sec maximum flow rate on Bambu’s standard 0.4mm (not high flow) hotend using Sunlu HS-PETG. This was measured using the Orca style maximum flow rate test pattern (which regrettably I had to hack together myself, since Bambu’s slicer doesn’t have it built in).
For anyone who hasn’t been following trends, you may be surprised just how fast the high speed PETG’s can flow. Faster than PLA even. Prior to a year ago, that was never true.
I sincerely doubt the need of going for knockoff hotends. Hardened steel nozzles would lasts a very long time already (even for CF materials, you would only start to see the effect of abrasion after roughly ~40kg of highly abrasive CF materials, and that would generally take a very long time). Many X1C users only need to swap the nozzle once… during the entire generation.
If you print PPA-CF or PPS-CF it’s good to have spares just for them… but the problem is, the filament being so expensive, do you really want to go cheap on hotends and take the risk of failling it 
? I wouldn’t for sure, until some actually better nozzles start to come out to the market…
Also Sunlu HS-PETG is a bit cheating with the flow rate (it’s slightly foaming, thus the flow rate and also the matte finish. It’s quite similar approach that Bambu PETG-HF is doing, just a bit more.). The strength (e.g., tensile strength) takes quite a beat because of that.
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In answer to your question: no, I wouldn’t want to be the first penguin off the ice flow to do that experiment. However, if one or more people with trustworthy reputations on the forum and already done the experiment and gave it a thumbs up, then I’d be comfortable following their footsteps on the trail they blazed.
I think it’s a legitimate area for some motivated person or persons to explore though. I mean, AFAIK, in terms of High Flow nozzles, Bambulab currently only offers the 0.4mm HF hotend. What if someone wants a high flow nozzle of a different diameter? Just wait indefinitely for Bambulab to offer one?
Regarding knock-offs, are they really all the same? Unless they are currently all the same, I can at least magine that some might be bad and maybe some that aren’t bad. So, for that reason, it doesn’t seem fair to dismiss the entire category as though they were all one thing. The CNCKitchen video that @user_3905127299 posted above suggests that, at least in the samples Stefan tested using the particular filament he tried (probably non-abrasive), they might even be better than a branded Bondtech CHT nozzle. Admittedly, none of what he tested were specifically H2D, so that alone isn’t enough to answer the question for H2D. More like a proof of concept that it could be possible.
Am I wrong? Maybe I’m overlooking something.
Anyhow, speaking only for myself, and until I hear differently, yes, I suppose you and I are on the same page: I plan to stick with Bambulab nozzles. I only wish Bambulab were already offering the full complement and could keep whatever they do offer in stock.
You nor I have any data to speak of for that and I know you know that. You can keep moving goalposts, that’s fine
My tz2.0 and pcd nozzle have over 2500 hours on it for what it’s worth. If I need to replace the hotend, it’s $7.