In short, the T2e absolutely is as close to an “ideal” device to jumpstart other OS-alternatives for those who have “no idea how to do that” as one will find today.
My alt-OS/AOSP journey began a little over a year ago with the purchase of a Samsung S6 and loading /e/OS- it was frustrating and hair and blood pressure-raising but with the help of the /e/OS community and one member in particular (SuzieQ) I got it rocking and haven’t looked back.
From there, I gained enough knowledge and experience to load /e/OS onto a Samsung S9 (which I use as a daily driver today) and have purchased a T2e from e.foundation with /e/ pre-loaded as a backup (the S9 under /e/ does not support VoLTE and may not be usable as 3G gets shut down next year).
I know that the above may come across as an advertisement of Murena/e/ and it is in a way, but one needs to recognize that resources are finite and precious. The Teracube team has made available to the general public wonderful devices for the vast majority of users who want to support Big-Tech alternatives with a pre-installed OS that meets the needs of the majority of the buying public- but they cannot expend limited resources on a niche market of a niche market! We should all want the Teracube team to expend their resources on what they do best: constructing physical devices that allow us to tailor them to our needs, not the needs of Big-Tech and Big-Surveillance. I, for one, am looking forward to T3!
For OS alternatives, we must look to the AOSP community and from personal experience the /e/OS (Murena) is the best-fit for me. While in extreme Beta, the OS works for almost all daily needs so long as you taper your expectations. If you expect an iOS-level smooth ride or need to play multiplayer games on your mobile, you will be disappointed. But keep your expectations in check and recognize that you have ceased to be an economic unit of Google, FB/Meta, Apple, etc. and I would expect that you will smile every time you ring someone up knowing you have withdrawn your consent and refuse to play the Big-Tech game any longer.
If this sounds remotely like what you are seeking to accomplish, I would seriously consider “jumping in the pool” and getting on the waiting list at e.foundation for a T2e.
Best of luck to you.