Missing Modules such as RFQ, Purchase request and Store room

Missing Modules such as RFQ, Purchase request and Store room

Hi,
I wonder why zoho doesn't add Purchase requests module e.g. ( a lower level staff wants to request for provision of something) which can be approved or rejected by his/her manager. In case of approval, same request can be converted into RFQ. 
Secondly for a factory or workshop they have stores for equipment/consumables, there should be a dedicated module for store rooms to keep track of the internal inventory e.g. tools taken out from store and then taken in at off time etc.