Right
Nyal by your own admission you don't like Wilson speakers.
Trust me when I tell you it isn't a phase coherent mess
Give me a call when you're in the area as I might want to prove you wrong. BTW, I'd be careful as an acoustician that you admit this on open forum as it will no doubt affect your clientele
You should try them using an active crossover like the JL Audio CR1 and a higher crossover point, you might be surprised. Or you could be close minded like most other audiophiles and stick to the old ways of doing things so as not to put anything in the **sacred** signal path.
With respect to Wilson, I just think for the money there are far better speakers out there. If a client is using Wilson, then that is their own choice, my role is simply to help them improve their room acoustics and perhaps if they are open to it educate them about the off axis response of the Wilson as compared to other speaker designs. There are a bunch of other speaker designs out there that I think are not great either, such as B&W, and then others that know what they are doing but make very questionable (in my opinion) voicing decisions such as Raidho.
I'm sure your setup sounds great, as I have run subs under speakers without using a crossover, and as long as you are bringing the subs in where the mains roll off then it can sound very good. It can also be challenging to integrate subs using this approach, and doesn't give you many of the benefits of using a subwoofer system, such as reduced distortion from the main speakers, room mode cancellation resulting in smoother frequency response and reduced modal ringing, speaker boundary interference (null) fill.
The real point of using subs is to get a nice smooth response under 100Hz. If you can get that by other means then no need to really use subs, perhaps beyond just extending the low frequencies that the system can produce. However most people have sub-100Hz responses that are all over the place, and then think they have accurate bass. Most have no reference for what accurate bass sounds like. Once you do it is very easy to hear even the slightest room mode coloration. I'd say 90% of rooms I have visited have obnoxious bass issues.
Subs are great because most room treatment becomes ineffective around 70 or 80Hz, and in the range below 100Hz you have the worst room mode issues, with widely spaced room modes and the major SBIR nulls. If you can solve that passively then that is great, but for most situations a properly setup sub system with a little EQ and rolled off main speakers using an active crossover is going to work wonders.
I say this with true belief: any audiophile who is seeking reference class sound should at least once hear what a properly designed subwoofer system can do. I don't think anyone would go back after that. Mostly it is peoples attitudes and deep set beliefs that stop them trying out new things. To be honest most of those beliefs are audiophile BS. Our knowledge as a community of how to use subs in the low bass has advanced tremendously in the last 10 years, although unfortunately some manufacturers are still stuck in the old school, and many audiophiles have old school beliefs.