I work with one of very large companies and I'm unfortunate to witness work of mulesoft as well, I don't know if this whole platform is simply so shit or the team "doesn't hold it right" but I would not surprise me if the sole problem in linked article is just that - mulesoft. Maybe it's programming-by-filling-in-wizards or something else - I don't know and don't care, judging from the output I see, they don't deserve to be called "system integration" by any standards, my recommendation is - avoid.

I have used Mulesoft, and while it was not the most exciting technology I would not consider it shit. Also I don’t remember it being wizard based, but could have changed in last couple of years. Depending on your role, if you don’t care what the root cause is you also don’t need to worry about it. Ask the people who have to care what the issue is and help them in resolving it.