You really think that it only took “months” for Apple to create the Siri Intent for third party audio? Apple had been opening up Siri for years by adding new intents.
Apple has a long history of developing functionality and using it internally before releasing them publicly. The alternative is releasing a half baked API that it has to support forever. It’s a lot easier to change an API that is only used internally than it is to change an API which people depend on.
Yes, Apple produced a better solution than allowing random third parties the ability to record everything you do on your phone. Would you prefer that they never increase privacy and security?