While almost every process can be improved, you've either made a big mistake or want to make one. If they're suffering the dire consequences that you predict,

While almost every process can be improved, you've either made a big mistake or want to make one. If they're suffering the dire consequences that you predict, the mistake that you've made is joining the team. Newcomers can't fix systemic problems unless the organization actually wants said problems fixed AND said newcomers are tasked with fixing said problems. Even then, odds are against success. If they are shipping reasonable product, then they're not suffering said dire consequences. (You did check whether they ship before you joined, right?) In that case, you're fairly ignorant about some key aspects of the company and how it works. Such ignorance is a bad basis for suggesting change, no matter how good said change might be.