These blog posts often allude that the EU regulatory bodies are just slightly incompetent or short-sighted and these fragmented national models happen by accident. But unfortunately that's not the case: The EU pretends to be a single-market and almost mantra-like the EU officials keep repeating it. But the fact of the matter is that there is neither a single market nor is the European public ready for one. If there was a true single market (like the US has one) - then this would very quickly lead to massive changes in the labour market. Imagine all the Romanian construction companies suddenly building office buildings in Madrid. Or countless Polish architects suddenly undercutting the much more expensive architects in Milano. Whether they know it or not, Europeans would like to have all the benefits of a single market (mostly more competitive pricing) without any of the downsides (massive labour shifts) - but that option doesn't exist. So what they do is harmonize regulation for a few big corporations, while all the smaller companies (and their employees) still get to keep their national moats.