Technology and marketing split when the product, the website, and the campaign describe three versions of the company. Buyers feel that split even if the teams do not.
Put one owner on the offer. The site should use the same words as the sales conversation. Campaigns should land on a page that continues the promise. Automation should support a handoff a person still owns.
That is the reason Sovassa keeps build and market in one plan. Separate vendors can still do the work. They should not invent separate companies.