Most comparisons between hiring in-house and working with a virtual assistant start with a spreadsheet — salary versus a flat monthly rate. That's a real difference, but it's not the one that actually changes outcomes.
The commitment curve
An in-house hire means four to eight weeks of process before someone starts, and once they do, walking it back is expensive — for both sides. A mismatch isn't discovered until months in, and by then, unwinding it costs more than the original hiring process did.
A trial period changes that curve entirely. You find out whether the working relationship actually functions before either side has committed to it.
What doesn't change
The bar for good work doesn't lower just because the arrangement is more flexible. If anything, it should be easier to hold a flat-rate, no-contract relationship to a high standard — there's no sunk cost pulling you toward tolerating a bad fit.
When in-house is still the right call
Some roles genuinely need someone in the building, on your equity, growing with the company long-term. This isn't an argument against ever hiring in-house — it's an argument for not defaulting to it for tasks that don't require it.