Good to see some of my speculation is shared with others.
For one thing, I think there was a sort of ideological mistake in seemingly keeping the LS from being as good as it could have been just so that it didn't get as "good" as its Jaguar cousin. I'm not positive that this was a concious effort at Ford, but it seems that way since Ford had nice V-8 options on their own that the LS was not allowed to take advantage of, instead receiving a smaller, less powerful version of the Jag V-8 (and they both used a Ford engine for the V-6 so for assembly sake a Ford engine couldn't have made much less sense).
Out of the gate, the 2000 LS just needed a better interior than the bland and less competitive interior it ended up getting. I haven't been in either interior in many years, but I think even the 99-03 3.2TL had a nicer interior at a more attractive MSRP (FWD, true, but in the eyes of some customers that may have not been a big deal). The 2002 ES is a major player in this price range and had one of the nicest interiors of this price. Those in charge should not have finalized the interior if it couldn't even match a Passat. In comparison tests the LS often faced off with the 3-Series and what not but some of these offerings like the ES and TL are probably more along the lines of its real life competitors if I had to guess. And Ford could've snagged more headlines with a more macho V-8. The 95-98 DOHC 4V 4.6L in the Mark VIII made 290 horsepower, and in a particular Mustang (Cobra or something? I forget exactly) that version of the DOHC 4Ver made 320 horsepower. How about a 300 horsepower LS V-8? Might've ignited more interest a manual option for the V-8.
NO, The Ford V8s would not fit between the the tight spring aprons.
Lastly, six years wasn't so long for a single generation, but even so the midlife facelift needed to be more notable. The interior could've had some things like a new wheel, center stack, other things that don't cost all too much to redo but are more visually substantially new. Similarly, more significantly changed front and rear ends would have kept the LS fresh. That 2003 refresh could have even jumped Cadillac in offering a bad boy American performance sedan by tightening it up and dropping in the Cobra's 390 horsepower supercharged V-8. Now you're talking M5 power for, say, 50-55K (starting).
The DEW Platform was so expensive, it bled red ink all over the floor of Wixom
The LS had a lot of potential and early on it had a good run, but sadly I think it was held back somewhat and wasn't kept fresh. Ideally, I reckon it could have been kept fresh enough to hang on for the 2007 model year. The 2008 Falcon's platform could have been engineered for a more global effort. Two "efforts": A mid-luxury, LS sized Lincoln to battle the 5-Series/E-Class crowd. The second a smaller sedan to take on the (at the time) CTS, 3-Series, etc, replacing the LS as the entry Lincoln (or keeping the name and changing the size, whatever).
The LS was a great concept but DEW was basically too expensive to make it work, Ford desperately tried to save money where it could and paid the price of less than wonderful interiors, Had the LS been Falcon based, it would have been a huge success.Just my opinion of course.
The only vehicle related to the LS was the more upscale Jaguar S-Type.
