Do you think SaaS companies should prioritize specific value propositions over high-level messaging, and if so, how can large, multifaceted companies achieve that level of clarity?

The brilliant PMM consultant Anthony Pierri often posts on LinkedIn about how SaaS companies tend to default to vague, high-level messaging, especially on places like their home pages. So much so, that sometimes you can read a company's home page and still not know what they do. His recommendation is for startups to be extremely specific about what they actually do... not what the high level outcomes (like ROI or revenue) are. Do you share that perspective? If yes, how can big companies who do MANY different things get specific like that?