Same here . . .
I tried to make sense of the "new" semicircle thing; but it's not very useful, although there is a way to get it to show 5ths, where if you click on "C" it shows "G" and so forth,
I never used the "Circle of Fifths", mostly because I started playing string bass professionally in the early-1960's and several years later started teaching myself how to play electric guitar (rhythm) and than a decade or so later, lead guitar.
I think the difference regarding not needing the "Circle of Fifths" is that bass player learn the songs "Louie Louie" (The Kinsmen) and "Sleepwalk" (Santo & Johnny), which are the two most-used patterns in what one might call "popular music".
"Louie Louie" has the bass pattern {1, 4, 5}, and the "Sleepwalk" pattern is {1, 6, 4. 5], which is "Louie Louie" but with an Am if the root is "C".
Technically, it's a -3m or whatever, since the second note and chord is lower than the first note and chord rather than higher. It's {C, Am, F, G}, while "Louie Louie" is {C, F, G} when in the key of "C", although it usually was played in "A" by garage bands, using Barre chords.
Flip "Sleepwak" and play it upside-down and the verse is the chords for "Louie Louie" but in a different order {4, 5, 1} as in "Heat Wave" (Martha & The Vandellas), which is the best song for determining how good your "by ear" identification of chord patterns is.
"Heat Wave" also has a reverse "Walk Don't Run" (The Ventures) Intro.
If you can listen to "Heat Wave" and get the chords without needing to experiment, then your "by ear" identifying is excellent!
Bass players learn this stuff and then map it to rhythm guitar; so my initial thinking was that the "Semicircle of Stupidity" might make sense to guitar players; but a simple test provided the clue.
You can click on the "Sleepwalk" chords in the PreSonus Studio One 7.2.3 "Circle of Fifths", and it works without needing to change from Major to minor for the second chord.
However, in the "Semicircle of Stupidity" you can start with C Major but there is no way to get it to play Am without changing if from Major to minor, which pretty much makes it useless.
One might hope there is some type of logic to the way the "Semicircle of Stupidity" works; but after messing with it for an hour or so, nothing logical appeared.
On the good side, if you have Reason 13 (Reason Studios), then there are Rack Extensions that do different types of automagical chord patterns and sequences; and you can run them in Fender Studio Pro 8 via the Reason Rack VST.
Learn these four songs intimately ("Louie Louie", "Sleepwalk, "Heat Wave" and "Walk Don't Run"), and it's the chord pattern for every popular song of the 20th century, with a few variations, of course. At the time, these were monaural, which is the best way to study them.
Prior to "Walk Don't Run" drummers played Big Band style drum rolls; but this changed with "Walk Don't Run" and a while later with the way Ringo Starr (Beatles) does rimshots and drum rolls. So the style earlier was like Buddy Rich and Gene Krupa played drums, but then it changed to the session drummer on "Walk Don't Run" and then Ringo Starr.
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NOTE: For the younger folks, there was and continues to be a "naughty" version of the lyrics for "Louie Louie", although nobody actually knows the best version of the "naughty" lyrics. History suggests J. Edgar Hoover (FBI) was obsessed with determining whether the lyrics for "Louie Louie" were communists or risqué, but after having FBI Special Agents study the song for days or weeks, they realized there literally is no possible way to determine what they actual lyrics are, let along the various "naughty" versions; but the other side of the coin is that the lead singer for every junior high school "garage band" had a version of the "naughty" lyrics, which clearly included the phrase, "f--- your girl all kinds ways", which was the way things worked in the early-1960's. The other clue maps to "every night at ten". This was nearly too much FUN for teenage boys, and the teenage girls thought it was funny, too. it was a big hit song, all because the singer mumbled the lyrics. 
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