If you don't believe the realtor is worth 6%, then by all means skip past them. There are plenty of fixed-fee sites that guide you through the process, provide legal form docs, and so on.
Clearly not everyone needs, or wants, a realtor. But presumably there are enough who do to keep them in business. There are enough who don't to keep the "do it yourself" market in business as well.
Choice is good. What is good for you might not be good for the next person, and vice versa.
Realtors in the USA can charge 6% because they're part of a cartel. In other countries where I've lived (UK and China) real estate agents typically charge between 1% and 3%.
It sure isn’t worth 6% of the sale price, especially considering that the sale price is literally double what it was 2 years ago.