I used to think that, but honestly after recently going through a job search I think it's untenable for most scenarios. As a candidate, I want to be able to interview with multiple companies simultaneously—if I had to do a trial week with each company, I'd never be able to get multiple parallel offers.

There's also significant onboarding complexity which I hadn't factored in. One company had me do a trial period and it took me half a day to get productive—time which is a sunk cost for them (since they had to pay for it) and made me feel bad about my lack of productivity. In the same time period it took to onboard with their codebase/build tools, I could have easily completed a full interview loop with another company.