While not introducing themselves is rude, I struggle to understand why that means people should refrain from contacting support?
On top of that, of course they may suggest things that you’ve already tried. They’re not telepathic, and it’s common in the tech support world to run through a list of common troubleshooting steps to ensure that all bases have been covered. I deal with this all the time when I have to contact tech support for my Internet at home. I have to tell the technician “yes, I’ve turned it off and on” every single time. It doesn’t mean that they are any less competent because they’re asking you to repeat steps you may have already tried. You would be surprised how many times people will think they have tried a troubleshooting step, only to realize they’ve misunderstood or completed the step incorrectly.
As for 7GB of ‘Other’ storage - that’s actually a perfectly normal number. ‘Other’ storage can take up anywhere from 5-10GB (maybe a bit more) worth of space at any given time, as it is comprised a number of different things, including system files and temporary files. It’s not unusual for that number to go up after updating to a new operating system.
I agree that there IS an issue with the new update, such as in OP’s post where ‘Other’ is taking up 23GB of space (that’s unusual and a lot!). However in your case, that may be perfectly normal. Please keep in mind that new operating systems are designed with newer devices in mind, and those newer devices start with a minimum of 64GB.
I’m sorry you’re dealing with this, but again in your case it’s entirely possible it’s completely normal. Please don’t discourage others from contacting Apple Support because of a less than stellar experience with a single employee. I’ve also gotten a survey almost every single time I’ve either bought something from Apple or contacted their support. If you get it, you can fill it out to let them know about your experience.