Walk into any vendor pitch in this category and you will hear the same phrase. It will be on the hero of the website, in the keynote, in the case study. The phrase is doing real work for sales teams, but for buyers it has lost almost all of its meaning. The single pane shown in the demo is not the single pane you get in production. The data feeds that look real-time are cached. The fields that look unified are mapped to a different schema in three places. The view that looked like one product is actually four products stitched together with custom services.
None of that is necessarily disqualifying. Every architecture has trade-offs, and a stitched-together solution might be exactly right for your business. The problem is that buyers do not know which trade-offs they are signing up for, because the vendors do not present them. The buyer's guide closes that gap. It gives you the seven trade-offs every architecture in this category makes, the vocabulary to ask about each one, and the rubric to score competing vendors against each other.
The right single pane for a 50-person business is not the right single pane for a 500-person business. The guide is calibrated to the SMB and lower-mid-market reality.