At the end of the day having lawyers and accountants expend their (vast) capabilities on something that creates no value is a sad waste of human resources. Our tax system occupies so much valuable talent and extracts far less value than it consumes. Any amount that complexity can be reduced would free up some of those capable people to follow other pursuits that could contribute tangible benefit to society.
We don't even have to get too extreme about what they could pursue - move those people into watchdog roles to manage public funds and watch the cost of government drop.
I don't disagree, but I don't think it's correct that to make this point more about tax lawyers than any lawyers, or than about farmers.
Why do you need farmers? They're just wasting their time riding around on tractors when the crops grow themselves. Wouldn't it be great if we could move them all to a job where they actually make something? Yes, but the reality is that crops require people riding on tractors.
And getting crops to people requires investment bankers and investors.
And getting investors requires lawyers. And tax lawyers.
Yes, if there were no tax, you wouldn't need tax lawyers. But there is tax, and having tax is a good thing. And you can't have tax without tax lawyers any more than you can have apples without johnny on a tractor.