RIck Steves is not the be all and end all of foreign travel advice.
Why so many Americans hang on to his every word is beyond me, we are
all different and we all have different tastes and interests.
I had barely heard of RS until a few years ago, when I found him on some PBS fund-raising marathon. I've watched a lot of his videos and bought some of his guidebooks.
I think it's ironic when people seem to want to begin - and end - their research into European travel with RS's videos and books. Because my takeaway from them, is that he encourages people to develop travel skills for themselves and to overcome the inhibitions and fears that would keep them from exploring the world beyond their country's borders.
Of course, he wants us to buy his stuff and book his tours. And I see nothing wrong with his personally curated guidebooks which cover places he's enjoyed and thinks that others will too. Guidebooks that aren't intended to be encyclopedic and exhaustive as to all places of note in the country/region in question.
But my impression of him - and I've never met the guy so I could be very wrong - is that he'd do a facepalm if someone said, "Ya know, Rick, we were in [name of country], and had a chance to see [name of notable place] and kind of wanted to, but it wasn't in your book and so we passed it up." OTOH I think Rick Steves would be delighted if someone said, "I got interested in travel by watching your TV show and reading some of your guidebooks, so I read some more guidebooks in addition to yours, and did some more research, and went traveling. Saw some places on your list and some that weren't, a few things went wrong and most things went just fine, and it was all a hoot."