I've worked on products like this. Some explanations include: * Copy-paste code reuse * Existing implementations aren't in a common library location, making

I've worked on products like this. Some explanations include: * Copy-paste code reuse * Existing implementations aren't in a common library location, making them hard to find/nobody knows about them * Lack of knowledge about the relevant platform built-in implementation * Corporate organization is not set up to make information sharing easy * Product team organization doesn't include a core UI assets team * Product teams organized by feature and don't communicate