It's a rare story though as most of the comments on the LTG thread say that after achieving LTG they will
a) move to BA (to collect another lifetime trophy)
b) move to Star Alliance
c) continue qualifying for WP
Perhaps most people do use their LTG benefits but they just don't post about it in the LTG thread.
Again, I think understand where you're coming from. The title of the thread you're referencing really sums up the situation -: "Life Time Gold - The
[Realistic] Holy Grail"
Qantas make LTG
realistically achievable, but beyond that, it's
exceedingly difficult to go any further (i.e. LTP), hence the use of what I always viewed as the slightly tongue-in-cheek label of it being the "Holy Grail". They don't encourage Frequent Flyers to remain loyal beyond this, so many people - especially here on AFF - will simply keep LTG in their back pocket and go looking for what makes the most sense for them and their current/upcoming travel needs and patterns. LTG is a nice safety net when your days of frequent travel are behind you, but if you're no longer being encouraged to remain loyal because you've attained the "realistic Holy Grail", then you're likely going to looking elsewhere. As I mentioned earlier, it's about people playing the game to their own advantage.
Of those who achieve LTG, some will then move onto BA and aim for LTP as BA has/had the only somewhat viable path for the average status chaser (vs QF's 75,000 SC target). Some will target status on other airlines/alliances (if it meets their respective travel needs) so as to obtain a more consistent experience across multiple alliances, safe in the knowledge that they will maintain a minimum set of benefits across OWA despite not really focusing as much of their spend or travel effort there. Some will continue to earn WP on Qantas as their respective travel patterns/needs dictate that it's achievable and they may as well enjoy the added benefits whilst they can, but again, they have a soft landing to LTG when those patterns change. Finally, there will be some who will simply use their new-found LTG status as the opportunity to target BFOD, again, safe in the knowledge that they have a lifetime safety net when their circumstances change. There are bound to be all sorts of permutations in between and I'm sure, just like
@significance, there are those who specifically target LTG as their endgame situation because it precisely meets their needs/wants both now and into the future.
Frankly though, I'm not sure anyone is really chasing LTG with a view that it is simply a "trophy".