Deco dives are recreational dives for all divers worldwide who have a recreational diving certification which allows for deco dives. Whilst US-based for-profit agencies generally do not release such certifications, many other agencies worldwide release them at their higher training level.
For example, my 3-stars CMAS diving certification sets a max depth of 50m in air with deco also on air.
Here in Europe and UK a lot of divers are certified by these not-commercial agencies. Not all of them reach the highest certification degree. But also divers who get only one-star certification have this concept that deco on back gas is a fully recreational activity, of course requiring proper training, proper equipment, and proper certification.
About numbers. PADI issued around 1 million certifications per year worldwide (before pandemics):
CMAS, instead, released roughly 250,000 certifications per year (I do not have an official number, this is what I heard during a presentation back in 2018), through their over 130 affiliated federations operating in 102 countries:
Federations
So you could say that roughly one diver over every 5 considers deco as a safe practice for recreational divers, the others 4 think that deco is a dangerous practice requiring special "tech" training.
Back to topic: proper trim and buoyancy control was a very important topic during my first-level (basic) CMAS training, so again I think that the same statistics applies: for CMAS-trained divers (one over 5), buoyancy and trim are basic skills who should be mastered by any (advanced) rec diver, whilst the others 4 over 5 think that being able to maintain the wanted attitude is an advanced skill, which is in the realm of technical divers only. So in reality I think that there is a strict connection between deco practice and trim control, as both are "tech" capabilities (if we accept the definition of "tech" used by the majority of divers).