I don't see any professionals turning to this for EMC/EMI testing, they already have all the test equipment for that job.
That's absolutely missing the point. EMC/EMI testing is expensive, time consuming and requires scheduling and experiment design.
Being able to do local soft-run testing on-site to be sure that you eliminate the easy 90% of issues before you get to the lab would be a huge win.
How about "non-professionals"? It could be useful to check device before sending for pre-compliance / compliance checks and save money - that would avoid very expensive iterations.