Mostly Time and as time is money that also. When you building custom application, you are trying to do it in most optimal way for the $ paid. So, when you buil

Mostly Time and as time is money that also. When you building custom application, you are trying to do it in most optimal way for the $ paid. So, when you building something for the value $ let say 100 SP (story points), and then when you stumble on a problem in OS usually you do not end up building 100000 SP side projects (worth $$$$$$$ of your time) in order to complete 100 SP project. Especially when you crossing to someone else domain. Everyone has its own domain, so if Google, FB, Oracle, Microsoft have the main code base for Java, C#, JavaScript, React, Angular ... or else, it is expectation that they will listen cries of users, sometimes they do other times they do not. Few years back I was involved in Google Chrome thread about auto-fill feature, at the time I was working at the health organisation, so to cut the long story short auto-fill was populating data and causing issue, in the very long thread I gave number of cases why is automatic form fill bad (and I was proposing some one-click alternatives), at the end Chrome team was sticking with what they wanted, and justification was "Because we are Google team, and you are not, so what ever we say is the best" - end of the story.