Most of your points also apply to open source software, and aren't strict requirements for proprietary software.
- discontinued: Atom just got discontinued. It's open source. Photoshop on the other hand has withstood the test of time.
- Audacity's 3.0 update removed a feature I relied on. I wasn't forced to update to it, sure, but proprietary software doesn't force updates either.
- Being able to fix your own bugs is a great part of open source! But not something most professional software developers really expect to do for their IDE.
- open source formats are probably more resilient than closed source, but I would argue many proprietary formats are also pretty resilient. Code is also based on plain text at it's core, like latex, so it's always going to be pretty resilient.
- you'll never have a guarantee that a tool you invest time in or money in will be the leading tool in five years.
- discontinued: Atom just got discontinued. It's open source. Photoshop on the other hand has withstood the test of time.
- Audacity's 3.0 update removed a feature I relied on. I wasn't forced to update to it, sure, but proprietary software doesn't force updates either.
- Being able to fix your own bugs is a great part of open source! But not something most professional software developers really expect to do for their IDE.
- open source formats are probably more resilient than closed source, but I would argue many proprietary formats are also pretty resilient. Code is also based on plain text at it's core, like latex, so it's always going to be pretty resilient.
- you'll never have a guarantee that a tool you invest time in or money in will be the leading tool in five years.