> Moving to the "four stroke" category, we can see 切 ["cut", today qiē]. This is as clear > as they come: it has a phonetic component 七 [today qī], and a semantic component 刀 > ["knife"]. There is absolutely no possibility that it could be interpreted as 会意, because > the meaning of the phonetic component is "seven".

Originally, 七 meant to cut vertically and horizontally (confirmed on a few sources).

Regarding 與 and 与, the site shows the breakdown for the former and shows how it was the older form for the latter. I guess you didn't actually click on the characters and look for the explanation. The analysis shows it comes from 牙+口+舁. The last is the meaning as well as pronunciation, the meaning being "hold up, carry together"

> > I confirmed a few, and they seem correct.

> Really?

Yes I did click through and read a couple of explanations.

As for 圓, according to the site the inner portion actually represents a picture of a 鼎 (ding). It is surprising to me, and a lot of this is theoretical and there will be more than one opinion. That same site doesn't say 員 itself is related to ding.

> if you search baidu for it you'll find a total of zero uses

There is a page on it right here. I cannot read Chinese but putting the first section into Google translate there is nothing surprising here. It also has examples. https://baike.baidu.com/item/%E4%BC%9A%E6%84%8F%E5%85%BC%E5%...