There is value in collaboration on anything in the world, but it will not automatically make it a better product, just because of collaboration. Designers fought with CEO's, Marketing people and other Stakeholders who were just simply not competent to provide usable feedback - and those people are not more competent now."Opening" up design will also not automatically make them more competent. What gives expertise is gaining experience from cultivating hard and soft skills that are needed to perform this craft.

Just imagine, opening up systems architecture or development to everyone. How would you feel if your first level supports sets up database tables?

The truth of this entire industry wide conversation, is that people believe they are designers because they have eyes. Because they can deem something as "not nice", they automatically think that they have become stakeholders for design decisions. Yes we don't need celebrity designers, but not everyone who has a subjective opinion about something visual is a designer. Imagine they'd have an objective opinion about relational databases or containerization and you'd have to hear them out, only to explain to them for 15 minutes, why their opinion is not constructive.