Why is the traditional character for 你 also 你 and not 儞 when the traditional character for 尔 is 爾? I found an interesting question posted on Reddit's /r/ChineseLanguage: If 你 is 亻（人） ＋ 尔 , but 尔’s tradicional version is 爾 , shouldn’t 你’s traditional version be 儞 ??  I don't know the answer so I thought I'd re-ask it here.  Some answers given there were:

marktwainbrain: According to Pleco, 儞 does exist and it is an old variant of 你.
catoncurtain: Well actually you are right, 儞
CosmicBioHazard: basically 儞 simplified down to 你 ages and ages before &quot;simplified Chinese&quot; was introduced.

I'm not sure if any of these are correct, although CosmicBioHazard's answer seems reasonable.  The Pleco entry is actually the CC-CEDICT entry:

儞 儞 [ni3] /old variant of 你[ni3]/

Question: Why is the traditional character for 你 also 你 and not 儞 when the traditional character for 尔 is 爾?
Edit: It was brought to my attention that Quora has a similar question: Why do all of the Traditional Chinese standards use 你 (with the Simplified 尔) but keep 爾? likely posted recently (prior to this question).  I was not aware of this at the time of writing this question.
in the book 類篇　卷二十二 (page 87 of the liked pdf), there was an entry:

伲儞你乃倚切汝也或作儞你你又乃里切文三重音一

that, 伲　儞　你 ・[these three characters are pronounced as] 乃倚切・[have the meaning of] 汝 (you)
the book “類篇” is edited between 1039-1066, in 宋 dynasty.
i would say that 儞 / 你 existed in the past, just not commonly used as 汝
have fun :)