Salesforce initially brought in the walkthroughs to change its content strategy. The idea of the feature was to guide and educate user with real-time contextual help within the platform, without the need for them to refer to any external resources.
But now it looks like Salesforce is not doing much with it. Probably we can expect some news about in the upcoming Dreamforce.
If you are curious, you could check out this article that explains why Salesforce, Oracle and ServiceNow adopted these walkthroughs - Why Multi Billion-dollar Enterprises Are Adopting Interactive Walkthroughs
P.S - You could use 3rd party interactive guidance and engagement platforms like Whatfix. It works like a breeze on Salesforce.