You sound like someone I'd enjoy working with! Clear and succinct (and I happen to agree with all of it, including the quality of the OP).
To quote a Nicolas Cage skit; "That's high praise".
The full phrase is "A jack of all trades is a master of none, but oftentimes better than a master of one"
As a full-stack developer myself, I've found this to be very true. Sure, I might not know every front-end framework inside out, but I've got knowledge elsewhere that someone who's only ever focused on the front-end won't have.
Yes, but tell that to the job market. Apparently, at least in EU, it's very trendy to pay full-stacks less money than those who are specialized in either front-end or back-end only. It's unfortunate.
Because the businesses wanting "full stacks" are cheap and view thier tech as an overhead/commodity. For some reason people are willing to work for them. If I am building the back end I would laugh and walk off if you started going on about me touching the front end. It's like hiring a data scientist and then forcing them to do the data engineering work also. Rediculous and hoaky.
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