As someone who's worked in over 20 companies as a technical consultant, I mostly agree. However, some companies are better than others at onboarding new engineers. My rule of thumb is to make a meaningful PR within the first week, and do whatever is necessary to make that happen. That sometimes involves bugging the crap out of people with questions, but I try to make up for it with a fast ramp and prodigious output.
Yes, we've had to tweak our on-boarding process for the trial period.
Most candidates have a local dev environment up and running in the first couple of days, and complete their first task (from our real backlog) in the first week. Within the 2-3 week trial period, most are able to finish several meaningful tasks.
