BBEdit is not a real time audio engine. It’s a text editor. And they’ve released thirteen versions which all require a relatively substantial amount of money to upgrade.
Isn’t that also a good thing - that a company has a business model that allows them to keep supporting an app for almost two decades?
What alternative would you prefer? That Apple ships the latest MacOS with a 68K emulator, a PPC emulator, all of the 32 bit libraries, classic MacOS in a VM, and all of the Carbon libraries forever?