Politicians are not generally domain specialists anywhere, their purpose is to make decisions and serve as a pretty face for some more or less coherent policy.
Lobbyism is very easy to complain about and can easily devolve into corruption, but it has a very clear purpose: To prevent policymakers from writing regulations that harm the affected industries without gain. This is especially necessary at the EU level, because the main purpose of that whole organisation is to lower trade barriers and regulatory friction-- lobbyists are somewhat helpful and necessary in that.
> I think the whole EU should be reformed
What would you suggest?