I have mixed feelings about LBB6.
On the positive side, it provided a lot of background information that couldn't easily be obtained elsewhere (it was very good in its day), it allowed for expansion from the basic world creation of LBB3, and the rules are fairly clear and concise.
On the negative side, RL astronomy has overtaken it, it requires a huge investment of time to generate worlds (even if you can find one of the very few fan-developed software aids to automate the number crunching), and its over-random system produces far too many 'anomaly worlds' (several if-then type improvements have been suggested by people on this site, but they're not included in any of the automations).
I see the 'hard science' vs 'every world habitable' debate as a separate issue. Clearly, the Traveller system falls in the EWH category, and if that's not to your taste then it's up to you to houserule.
I still use it, but only rarely, because I want to minimise the hassle. IIRC, it is the basis of all the current automatic sector generators, so if you reject LBB6, you're down to either building planets one at a time by hand, or going with a totally non-Traveller system.
Of course, AFAIK, all the current sector generators create standard 2D sectors so if, like me, you prefer a 3D TU, you're struggling anyway.
Summary: If you show me something better, I'll use it. Pleeeeze show me something better, it's been 25 years...