Until someone manages to open source the ME of various CPU chips tools like this don't offer much more than a cushion against basic surveillance. I can only imagine the shitstorm that is to follow when someone finally leaks it.
If not, then tails is a pretty good improvement.
Even if it doesn't mitigate every conceivable issue, it doesn't mean it's without value.
Yes, ideally using a different CPU platform is an option, but not if you want to do any significant work
Of course you would pay the price premium for that level of protection, but interestingly I have yet to hear of someone being compromised specifically via this mechanism.
With all that said, I am very seriously considering buying an ancient ThinkPad, just so I can run Libreboot on it.