I haven't really seen much dumbing down of the finder, and bear in mind that this is coming from someone who collects Macs as a hobby and has used every version of OS X at some point in the last 6 months.
The biggest issue was the tag/label system introduced in 10.9 that stopped coloring the all of the text(as it was in system 6 in favor of a small dot next to the file/folder. For those of us who have used tags for a while, it was a pretty shocking change as the dots are a LOT harder to see. At the same time, though, it allows you to put multiple tags on one file/folder. I've not seen the need to do this myself, and Apple has planted their feet pretty firmly on this being the way they do tags now despite disagreements to the contrary.
As a side note, the coding for this system hasn't changed since it was introduced-if I mount a volume containing files that was created in System 6 in Sierra, Sierra will read the tags.
Oh, and System 7.5 was way better than System 7

. I maintain that 8.6 is probably my favorite release of the "classic" Mac operating system.