Poor UI and second rates apps

I can’t believe there are companies out there making second rate apps and charging companies for it!! I am a experienced Power Platform developer and believe in doing a good job for the end user and to allow for the customer to have input and build what they want that works for them, a great system should take a few months and allow for growth. Why do I get asked to sort out other people mess! It’s simple for companies to build a decent system and get returning customers, if you don’t like what a developer is offering tell them to change it or change the developer!