Convenience? All those steps just to capture relative delay and major downside mentioned at the end sounds rather inconvenient to me. Not to mention crossover simulation with this method is locked to measurement distance, not actual listening distance. Maybe okay for small bookshelf speakers, but anything large will be problematic. I admit that I started into this hobby years back with an Omnimic as well following the Jeff Bagby mantra, but have since moved on years ago and never looked back. The Omnimic is just an SPL meter now, mostly collecting dust in the closet.
In any case, if you must stick with USB for convenience...you can skip a few steps. Re-calculating min-phase through HBT process simply isn't necessary, and often the primary source of error in this process. Use the measurements as-is. Just go to VituixCAD Tools Menu -> Auxiliary -> Time Align. Load your 3 measurements, un-check MP (min-phase), solve delay. Enter delay value in driver tab of main window, leave driver coordinates at 0,0,0 in the crossover.
But, with all the work that goes into a DIY speaker, why take a shortcut on arguably the most important part? Take a bit more time and gather the full spatial set of measurement data with 2-channel system properly.
Yes it is convenient (which can cover cheap in my book).
I had a ECM8000 and an Event pre-amp that died. It was a rather nice preamp by all accounts and I lacked the technical skills to diagnose and fix it. In NZ we don't have a lot of electronics support (or shipping to where it can be done would end up being the 2nd hand cost of the device itself). I was up for buying another pre-amp (and shipping) so upward of NZD $400+.
I'm aware of the downsides. That one relies on moving coil speakers being minimum phase devices AND only fixing Z in one axis (as most software doesn't allow for per axis Z). A per axis Z measurement would be far less convenient if one was to try and replicate what a 2 channel actual phase suite of measurements could achieve. For single channel measurement users, you are limited to "pick your listening axis" for Z setting. For 2 channel users, you have all this information, but like any crossover design, you have to pick your axis you optimise for (as you won't be able to solve all Z related phase issues with a single crossover).
However, I have found extremely good correlation with reality as long as you have the apply the method required.
For me, although not the topic of this thread but to put into perspective, we have the following bigger issues to contend with (and these impact both single and dual channel measurements):
1. A reflection free measurement environment - especially more difficult with 3+ way designs (and where ground plane is not possible)
2. Proper Mic mounting. A short range clip mounted mic with stand in the gated window will show high frequency aberrations that are not there.
3. Being able to to drive speakers above the ambient noise floor so enough information is collected to show HD products. Sometimes our listening spaces (family / neighbours) limit what we can do here.