I've been tackling this exact problem in B2B demand gen for a while. The core issue isn't that marketing is lazy - it's that they're building for the 'average' buyer while sales needs industry- and persona-specific messaging. Generic content forces sales to rewrite emails and decks, which kills deal velocity.
What's worked for me is instituting a monthly alignment cadence. First month, the whole GTM team picks one persona in one industry (e.g., CIO in Healthcare). Spend 30 minutes researching that specific person's current priorities and challenges - not a stale persona sheet. Ideally, grab an existing customer matching that profile for a 30-minute Zoom where the team can ask contextual questions about real pains and how our solution helps.
Then split into groups. Each group owns one challenge/priority and crafts a sales-ready message that maps a specific component of our solution to that challenge and the resulting benefit. Submit everything to marketing/ops to build sequences into our cadence tool (email, call, etc.) and we test variables like all-email vs call+email.
At month end, review results, keep what works, dump what doesn't, and move to another persona. This builds business acumen across the team, aligns everyone on real buyer needs, and produces content that doesn't need customisation on the fly.
Has anyone else built a feedback loop that forces marketing to work from sales' actual prospecting data rather than idealised personas?