Why Alaya Vinnana and Manas is not supported in Theravada? Why Alaya Vinnana and Manas is not supported in Theravada?

The objective of this question is not to criticise Mahayana teaching, but to compare and contrast the idea so we will have a better understanding of Theravada.
https://en.wikipedia.org/wiki/Eight_Consciousnesses
It is - https://www.budsas.org/ebud/ebdha195.htm

"Thus we can see that vijnana represents the simple reaction or response of the sense-organs when they come in contact with external objects. This is the uppermost or superficial aspect or layer of the vijnanaskandha. Manas represents the aspect of its mental functioning, thinking, reasoning, conceiving ideas, etc. Citta, which is here called alayavijnana, represents the deepest, finest and subtlest aspect or layer of the Aggregate of Consciousness. It contains all the traces or impressions of the past actions and all good and bad future potentialities. The Sandhinirmocana-sutra also says that alayavijnana is called citta (Tibetan sems)."