And speaking of toolboxes, while I can see that the other tech has you ruffled, please do consider that some of us, don't see T5 as simply New & Improved OTU rules, but as a toolbox to create our own TUs anyway we want ans some of us are more Space Opera than Hard Science people. Not that I plan on using the Dean or EM drive I think, but I am including things like Jump+ drives and Stutterwarp.
So before you blaze the errata thread with hate for those things you don't think belong, remember this is more CT sandbox/toolbox than it is MT with the OTU baked in goodness.
It wasn't my intention to put that in the current Errata list, more like creating another list based on the same principle, but specifically for trying to make the "hard-SF" part more solid. (However I personally think the blatant scam that was the Dean Drive would have its place in the Errata list).
That would be for people wanting a hard version to use for their own play.
As I see it, it wouldn't be excising things like Jump or Manoeuvre drive. It would be more to change how things work and/or are explained to make it more coherent.
So as minimal changes in the actual mechanics and technologies as possible to retain coherence.
For example, instead of forbidding NAFAL, something would be added/tweaked so you can't use it as unstoppable planet-cracker ISRM.
Another example, the Orion drive would see its fuel consumption changed, and dependent on level. And maybe be renamed, because I doubt the name will stick for centuries, let alone millennia - but I'm not certain.
Effects of nuclear weapons would be tweaked: the EMP requires a few conditions (no EMP in the middle of the atmosphere, for example); antimatter warheads still emit hideously strong (hard) radiation, it's fallout you won't have (vaporised fissile that poison the place for a long time)...
Optionally, I would have loved rules for waste heat. Heat management is actually one of the biggest parts in running any spacecraft, regardless of tech level (below nearly magic-like pre-singularity levels, and even then), with potential for great management gameplay during combat, and is pretty much completely absent, with a small exception for black globes.
But adding such huge element would be a new endeavour, not simply a correction - unless we are talking about a very, very simplified version.
While I love the idea of a toolbox allowing the GM to build their own TU in whatever way they want, including the entire toolbox in the basic rules makes the rules more difficult to understand. Perhaps there should be a Rules + Rules Light format, or Rules + Rules Advanced format. I don't even have a problem with the two being in the same document.
That would be helpful indeed.