I did pretty much the same thing with Dave Thomas's Programming Elixir book, bailing halfway through, using a 2nd resource to consolidate, and then returning to finish it.
I like learning Rust so far. The main thing I wonder is what kinds of projects are good to do while learning. I went from Node to Rails to Phoenix and normally I just rewrite web apps I've previously created in the language I'm learning. With Rust, it feels like I should build something different, something lower-level like a tool, an emulator or a 2D game.
If your experience is web apps, I would stick with that; Rust has a great web app story in the form of at least two mature frameworks.
It's true it's not a terse breakneck intro for advanced programmers. But as an experienced developer, I'm enjoying it no less for that. In any field I've been involved in, I've always enjoyed revisiting fundamentals, and in the context of learning a new (and let's be honest, not very easy or familiar) programming language this seems even more appropriate.
Perhaps if I were learning Rust for work I'd want something more distilled to get me started. Even there I'm sure I'd read TRPL at some point. But right now I'm finding it an enjoyable way to get underway for my own interest.