It isn't quite as simple as that. Congress needs information to create good legislation. That information has to come from somewhere. Ideally Congress would

It isn't quite as simple as that. Congress needs information to create good legislation. That information has to come from somewhere. Ideally Congress would raise taxes to pay experts to tell them about things they have to regulate. Sadly, people don't necessarily like seeing Congress raise taxes to spend money on itself and this has proven an effective weapon that some politicians, especially Republicans, have used to overthrow incumbents. So at least in the modern era we don't do nearly enough of that and even before our current era of open primaries and ideological partisanship we no longer have that at all and didn't have enough of it, to be honest, even in the day of the office of technology assessment and such. So we rely on lobbyists now to explain to our legislators when the "system of tubes" metaphor for the Internet breaks down. Hopefully we can get multiple competing groups in the door to prevent the advice from being too one sided but at the same time everyone presenting has an agenda. Which probably costs the taxpayer more than hiring experts would but that cost isn't obvious the way a line-item on the budget would be. And as bad as the current system is having legislation just based on what representatives know would probably be worse.