They have this highly data-driven process which optimizes for usage and engagement . The problem is I don't wake up in the morning and go "gee I really want to up my engagement with google maps today". The ideal information retrieval app consists of me retrieving information and closing it. This is antithetical to Google's monetization model, and thus Google Consumer design is not for my benefit.
That said each Google Product is like a different company and they do do good work here and there. Specifically the Google Cloud Console has improved tremendously over the years (no doubt due to massive investment). Is it perfect? Hell no. But I prefer it to AWS and Azure tremendously.