My impression too. I felt that in the past "solid apps" in practice boiled down to "rebooting the semantic web", and adopting / maturing the whole host of specs needed for end-to-end generic linked data app development defined by open standards. Solid as "Out with the old, in with the new. The web done right, this time". Which may be too ambitious.
Update: Reboot the semantic web seems still the goal. From About Solid page [0]:
> Solid is an open standard for structuring data, digital identities, and applications on the Web. Solid aims to support the creation of the Web as Sir Tim Berners-Lee originally envisioned it when he invented the Web at CERN in 1989. Tim sometimes refers to Solid as “the web - take 3" — or Web3.0 — because Solid integrates a new layer of standards into the Web we already have. The goal of Solid is for people to have more agency over their data.
A more manageable scope for the project would be "Personal data vaults for self-sovereign linked data" or something like that. That positioning would make me more interested than current "let's reboot" call-to-action.
[0] https://solidproject.org/about