There's tons of stuff i do as a product manager that neither tech nor ux will do:

* Finding new customer needs that are not yet covered by the product (new products, so not existing product),

* determining how a product might address that need,

* determining the alternatives, competing products, customers may choose,

* the (financial) risk of not addressing the need,

* the business case of creating a new team to implement this need product/capability,

* the pricing of said new product,

* determining what the key product features of the competition are that we need to address to be able to win deals when in competition,

* and what features are relevant according to gartner, to ensure we're part of the short-list of potential customers

* determine how to prioritize product releases and features to ensure we can win markets (think crossing the chasm).

* ...