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Solution architect certs aim to give a broad view of the AWS ecosystem. It goes into some depth on each service, but it more so challenges your understanding of how each service fits together to accomplish a specific goal in the most clinical and cost effective way.
As far as job responsibilities, the solution architect role is actually an advanced role in earnest, because on an enterprise level, you need to have strong exposure/skills in different IT domains: coding/software design, databases, networking, data security.
Also the role differs per company. In some companies, it can be a devops centric role which entails working with developers in provisioning the AWS infrastructure(services). For some it can be IT-compliance focused, just making sure the developers aren't designing systems that can get flagged during an IT audit. It can also range from very hands-on work to high level design