We differ very much on what the EU should/shouldn't do. You can already work for a company in one country and live in another. It might take a bit of effort on the employee's side, but that's it. Standardization of income taxes is a death knell for politics, and a sure-fire way to make the EU fail.
International banking is already settled, pensioning too. Insurance isn't needed. You can insure yourself in your new country.
> make it simple for one company to operate and hire in the whole Union
The banking situation is like an MVP of the real thing. You can't easily get a mortgage in another country, some of the banks can't even serve you in English, etc.
As for taxes, in theory, you could have a unified system that exposes a bunch of knobs for each country to turn as they wish. Some might even set some of them to 0. You can do much better than the current mess. I guess you can also do much worse, especially for the people who've already found their niche tax-wise.
Everything is an even bigger mess when you are a company (not even an employer). E.g. recycling mess mentioned here: https://www.pcengines.ch/recycle.htm
The employer's side is already very complicated though.
International banking is not settled. You cannot settle your taxes in Spain with a foreign IBAN, there are similar issues with many other services too (internet, phone and utility contracts, etc.).
I didn't mention income taxes, but payroll taxes i.e. the employer side. But income tax shouldn't exist anyway.
> Insurance isn't needed. You can insure yourself in your new country.
But the employer is usually required to pay it - e.g. national insurance in the UK, social security in Spain, that is a massive barrier to international work even within the EU. There needs to be agreements to split the payment to allow the employer and the employee to reside and operate in different EU member countries.
> Oh, I see. You're only in it for the money.
Making business easier makes us all more money (less friction and overhead = a bigger pie). I'm not even a business owner, but could benefit a lot if I could more easily move somewhere within the EU with a lower cost of living.
Indeed, we're on totally different sides of the isle.
> a massive barrier to international work
There are all kinds of agencies willing to make that easier for you. Sure, it costs, but that's business.
> I ... could benefit a lot if I could more easily move somewhere within the EU with a lower cost of living.
That's a perversion of the system. You want to eat from both sides: where the cost of living is high, the salaries are high, but you don't want to spend the money there. Instead, you'll drive up housing prices in a poorer country. "Some of you may die, but that's a sacrifice I'm willing to make."
International banking is already settled, pensioning too. Insurance isn't needed. You can insure yourself in your new country.
> make it simple for one company to operate and hire in the whole Union
Oh, I see. You're only in it for the money.