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Is there a specific reason articulation of combinations like [pɹ] as an affricate is judged to be impossible while /d͡ɹ̝/ is considered an affricate?

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ESTAR-3SG:P human-OBJ only human-OBJ true-OBJ REL-LOC play-3SG:A

can have unit rhotacized peripheral plosives (Pumi iirc), they're just not affricates

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Siöö jandeng raiglin zåbei tandiüłåd;
nää džunnfin kukuch vklaivei sivei tåd.
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How does something like [tʙ] feature into this homorganicism?

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Dibotahamdn duthma jallni agaynni ra hgitn lakrhmi.
Amuhawr jalla vowa vta hlakrhi hdm duthmi xaja.
Irdro. Irdro. Irdro. Irdro. Irdro. Irdro. Irdro.

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Siöö jandeng raiglin zåbei tandiüłåd;
nää džunnfin kukuch vklaivei sivei tåd.
Chei. Chei. Chei. Chei. Chei. Chei. Chei.

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Dibotahamdn duthma jallni agaynni ra hgitn lakrhmi.
Amuhawr jalla vowa vta hlakrhi hdm duthmi xaja.
Irdro. Irdro. Irdro. Irdro. Irdro. Irdro. Irdro.

I was looking at the greyed-out cells in the sibilant affricate/fricative rows of Wikipedia's IPA chart, in which the color means "articulation has been judged impossible." Then, I realized that [pɹ], etc. would be non-sibilant because of the [ɹ]. On top of that, those positions are taken by [pɸ bβ], thereby voiding the question.

Coarticulate = heterorganic cluster that behave as single phoneme
Affricate = coarticulate of homorganic plosive and fricative

So, an affricate is a subset of coarticulates. Coarticulates must be 1) homorganic, 2) stop+fricative, in order to be defined as affricates.

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vec

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Dibotahamdn duthma jallni agaynni ra hgitn lakrhmi.
Amuhawr jalla vowa vta hlakrhi hdm duthmi xaja.
Irdro. Irdro. Irdro. Irdro. Irdro. Irdro. Irdro.