Proprietary and non-proprietary are quirky across the board. For any piece of software, you literally keep hundreds of official releases, sub releases and patch

Proprietary and non-proprietary are quirky across the board. For any piece of software, you literally keep hundreds of official releases, sub releases and patch releases, and if the design support team knows what they're doing, they provide was to specify the right version for each design module. I can live with it: these tools are very complex and they don't have a lot of users. It's hard to make the bug free. But you don't make software buggy deliberately. It's different for Tcl. Some people made a conscious decision to create that POS language and others thought it was a great idea to add it to their software.