Some taxes are indeed the same or nearly the same over whole the European Union.
But others are not.
That makes that Belgians pay more tax than the surrounding countries (and a lot more than for example the US).
From the other hand, we have a very good social security system, some towns offer free public transport, very good medical care (no long waiting lists like in some other countries), etc.
Like I said, I suppose every system has it advantages and disadvantages.
I like the diversity between countries though. Would I travel for pleasure to Denmark or another country when those countries would be 100% the same as my own country ?
I doubt it. It's just because of all the differences that makes traveling interesting. One can learn enormously from those differences.
The same goes for people. It would be very boring if everyone would act or think the same way I do.
I always try listening to other people without judging them. Even if they think completely different than I do, in general, one can learn something from it.
In fact, the more their thinking or acting differs from mine, the more potential learning is hidden in there.
Patrick