[VK538FY]

I'd say that contentious question of 'posted workers' is enough to make me ask myself if it's worth the sacrifice to have the possibility to live and work anywhere in Schengen/EEA/EU. But the other replies to your message include further valid points.

Remember that legal, economic immigration in Europe is possible without Schengen style free movement. It really wasn't that hard before.

I'm willing to study facts (numbers) that prove the benefit of free movement but they would have to show that legal, economic immigration without Schengen doesn't bring the same benefit. And legal, economic immigration without Schengen seems to have a lot less disadvantages.