As someone who studied computer music in the mid 2010s I can second that! All the composers in my generation who use live electronics do it themselves.

The devide between composer and programmer has disappered for the most part and I think the main reason is that both hardware and software has become so affordable and accessible. Back in the old days, you needed expensive computers, synthesizers and tape machines and people who could assist you with operating them. Today, anyone can buy a laptop and learn Pd / Max / SuperCollider!

That being said, institutions like IRCAM still have their place as they allow composers to work with technology that is not easily accessible, e.g. large multi channel systems or 360° projections. They also do a lot of research, too.