Two roles, two business models
An AV integrator is the company that supplies, installs, and programs your technology. They carry product lines, hold manufacturer certifications, and earn their living on the margin between what they pay for equipment and what they charge you, plus labor.
An independent consultant designs the system, documents the specification, runs the competitive bid, and oversees the installation — but never touches the equipment commercially. Their compensation is a consulting fee, fully decoupled from what gear ends up in the rack.
Where the incentives diverge
Because an integrator's revenue scales with equipment, the natural gravity of a proposal is toward more: more displays, more control, more recurring service. Again, not malice — just incentive.
An independent consultant's incentive is your satisfaction and referrals, not the size of the bill of materials. That's why an independent eye tends to right-size a system rather than inflate it.
Why you often want both
This isn't integrators versus consultants. The integrator does essential work — installation and programming require skilled hands and real expertise. The consultant ensures the system is well-designed and competitively priced before that work begins, and holds it to a documented standard once it does.
On a simple project, an integrator alone may be plenty. On a complex six- or seven-figure build, having an independent party design the spec and manage the bid is what keeps both quality and cost where they belong.