Tahoe was tested. However, there are to many variables to replicate the situation of every possible user. You might have different hardware than someone else so that crash might only ever happen on your Mac.
If you would like to send Isaiah crash reports, I am sure he would appreciate them. The crash reporter tool that you submit does not go to him. Send them over to support@yourhead.com
He is already close to roll out a beta for fixing these crashes. He also asks for testers which are experienced the crashes.
More info in his discord channel.
Sorry, I was getting confused. Anyway, I’m really glad I didn’t install Tahoe. Apple with its vast resources is putting out very buggy software and you criticise Isaiah for not fixing a problem which never existed before Tahoe while he’s also trying to finish Stacks 6. Seems a bit unfair to me.
This weekend I worked on a website on both my Apple Mac computers (MacBook Pro M3 Pro and Mac Studio M1). Both Macs are updated to macOS Tahoe 26.
RapidWeaver (version 8.9.4) and Stacks (5.3.1) worked fine. No crashes at all.