Zoho Books / Zoho Inventory ??? WHY ????

Zoho Books / Zoho Inventory ??? WHY ????

I noticed in the Zoho Books What's New page:

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18 January 2021

New Line Item Fields

You can now display the Brand and Manufacturers fields in the line items by enabling them from Templates. This option is available for organisations with Zoho Inventory.
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So are all new features going to be dependent on having Zoho Inventory as well? I hope this does not become a norm. I find it quite repulsive.

A simple feature like including the manufacturer/brand name of an item in the line item on an accounting app would be dependent on an inventory addon?

Why not just merge Zoho Inventory and Zoho Books and make a new package called Zoho Books Pro Plus or something. Why do we have 2 separate web apps for pretty much the same functions? Don't be that corporation.