My kids went to a European International school with the IB and then to UK universities.
We have lots of friends and acquaintances that have gone to universities all over Europe. It is important to consider the fact that even if the course is taught in English, the working language around you will not be.
If you are at a large institution with lots of English speaking students and university accomodation, it can be fine. Also worth remembering that many many people go to other places to study and have a great time, but equally, this adventure is not for everyone.
I lived in Paris for 6 months aged 20, it was amazing but also had many very stressful moments. I had a number of adults around me who provided some support. Lots of students find their first year at university difficult. There are added complexity of living through a different language and a different culture. Yes.. still European .. but not English.. I grew up in Ireland and coming to England to university resulted in some things that I had to get my head around. I live in France now and even in my 50s find somethings challenging.
I think life for our adolescents is much more challenging than it was for us. I have been surprised at how many young people struggle at university, move during or after the first year, some with intense consequences, but these also happen to students in the UK.
In short.. don't unestimate the extra challenges associated with studying in another country and the extra support they might require.