I feel it's somewhat similar to using TurboTax or other online services to file your taxes. For those not in the US, the tax forms have a special field to fill in if the form was prepared by a paid preparer (licensed, I guess); TurboTax and other online services leave that field blank so you, as a taxpayer, are responsible for all possible mistakes that you didn't see in the forms you signed and sent.

I feel it's very similar to using an agent; the main difference is that we kind of trust that TurboTax won't hallucinate in your forms, while the agent surely will.