Personally? I think there is a lot of industry pressure to make cars "maintenance free". You have companies like BMW having oil change intervals like 25,000 miles and paying for all the maintenance for 50,000 miles and doing relatively little. Lexus has just gone to 10,000 mile oil change intervals on the new cars with synthetic oil and they have always very staunchly been opposed to drawing out oil change intervals when using synthetic oil.
If you have a BMW that needs oil changes every 25k...and BMW will do it for free for 5 years 50k miles...and a Lexus that needs a $200 service every 5k miles you can see the concern for Lexus.
Now, with that said technology is getting better and these synthetic fluids and better filters can last longer between changes...so only time will tell I suppose.
Analysis wouldn't have cost you more than $20 or so, and I disagree that nobody would care. I think such an analysis would have been of tremendous value to the Lexus community...