i dont know how long your build creator have been outdated, but its definitely been too long. if you want to add items to the build creator but dont know which items to look for, please take a look at previous patch notes.
also, please add a confirmation message before exiting the build creator to make sure you dont accidentally close the page, making the guide youve been working on for the last few hours dissapear so you have to start over. suggested this before, and got a response from a moderator, but nothing happened.
I hear your concerns (and share them to some extent). Although I'm not involved in the development of the build tool, I can see, however, how it's not that easy to make a design decision in one way or another. But those are good points you raised.