Maybe it would be more persuasive if you could show some kind of comparison or case study for switching? For instance, if you want to make it easier for people to adopt Azure Boards, then why should they adopt Azure Boards over the myriad other agile planning products out there?
More importantly, if you're trying to make individual services easier to adopt, why is there only unified Azure DevOps pricing and not pricing solely for the individualized products (excepting Azure Pipelines pricing, which is a per-agent pricing model)?