Sure, same is true for software startups. Trade long hours and slightly above market pay for a lump sum payment and predictable patient load? The increasing complexity of interacting with health insurance providers and diagnostic labs has something to do with it, also. Why wouldn't a lot of them do that?

In Canada, the governments have been actively discouraging the solo practitioner practices for GPs.

Turns out that telling your patients to go to ER or a walk-in clinic every weekend/evening/holiday/illness/leave isn’t the best care.

And continuity of care if you retire/fall ill is rarely done well.

Multi-practitioner clinics can share an on-call schedule or evening/weekend hours, get bonuses for doing so and save money.

Also allows for flexible schedules. Want to work 3 days a week? Sure! Had a child and want to still work the occasional weekend only for a bit? Ok!