Yes, I remember Wales received a lot of EU funding for infrastructure and there used to be those "funded by the EU" signs everywhere. They voted in favour of Brexit.
I think this sort of things does little to convince people. The road network was there and working before the EU, it is still there and working now.
Especially, people were well aware that the UK was a consistent net contributor to the EU budget so knew that EU funding for infrastructure was not reallly a benefit.
Well, except that in the UK the devolved nations (Wales, Northern Ireland, and Scotland) receive more funding from the government than England does. For instance, Wales received 20% more money per person than England does.
Devolution itself also means that, effectively, the UK government is in charge of England while the devolved governments are in charge of their respective nations, so just looking at which projects the UK government funds is misleading.
So, it is not accurate to say that regions are neglected, and you might even argue that ultimately the South East of England and England overall fund the whole country...
Overall, I do not know if that was specifically a benefit for Wales. Obviously in the end the Welsh decided that the cons outweighted the pros, anyway.
I think this sort of things does little to convince people. The road network was there and working before the EU, it is still there and working now.
Especially, people were well aware that the UK was a consistent net contributor to the EU budget so knew that EU funding for infrastructure was not reallly a benefit.