I thought I would chime in as I have been shopping for about a year. I currently own a 1994 Land Rover Discovery. It's full-time 4wd with a locking center diff. I have added OME all around, ARB Air Locker in the rear, Warn Winch, Safari Snorkle, full skid plates, etc. As it is a 1994 I am ready to replace it.
There are a ton of options out there but you have to decide what is most important. If full-time 4wd is really key then that would knock out the SR5 and the TE right away. That would also knock out the Xterra, Wrangler Unlimited. Having driven both Full-time 4wd and part-time, it really comes down to selecting the best option for road conditions. Yes full-time 4wd makes it a no-brainer but I don't think it provides better traction.
The SR5 has a softer ride then the TE. I guess my thing is, this is a truck and is going to ride like a truck. If you want a car-like ride then you will have to go with a uni-body style vehicle. That might be okay but it has it limits as well. The RR ad LR4 have independent suspension which helps the on-road ride. They are very capable off-road but are you going to take a $50k plus vehicle off-road? Also, you have reliability issues. If you don't believe be check consumer reports or any LR forum. I put up with it for 17 years because I felt that the benefits that the vehicle provided were more than the short comings. When I bought it, new, it was by far the best option out there. There wasn't another vehicle that offered full-time 4wd, solid axels, no rust aluminum body, V8, and the off-road ability that the Discovery did.
Today, LR has more reliability issues, mostly due to increased electronics. Jeep, well, again reliability issues, underpowered etc. Xterra, not as good of reliability as 4runner and very little aftermarket options.
So here we are talking about the 4runner. The TE, SR5, and Limited are very different vehicles targeted at different consumers. Most hard-core offroaders are not going to pay extra to have leather and all of the other bells and whistles that the limited has. The full-time 4wd costs more to make. To keep the price point where it is Toyota couldn't offer it in the other models. Would I like full-time 4wd in a TE, sure, but it's not a deal breaker to me. I would rather have the KDSS etc then full-time 4wd. The SR5 has some good options but again, is geared more toward the very occasional off-road driver and more to the urban driver.
I guess, in the end, you spend time shopping, researching, driving, talking to owners etc and should know the short falls before to buy. There isn't a perfect vehicle out there, if there was we would all be buying it, oh but wait, we all want slightly different things. Toyota does listen to it's customer base and they listen mostly buy way of what sells and what doesn't. Why do you think there are so many more silver, black, and grey TEs then Red and Blue? Because there is a great demand for those colors. Remember, Toyota has been selling cars for many years, and I am sure they track everything. They use that data to come up with a car they feel will appeal to the broadest range of customer at the best price. Believe me it is all about making money, not pleasing a select group. If car companies would want to please a select group you would see the Defender 90 come back, a diesel 4runner/Jeep Wrangler but you don't because the companies don't think they can make money selling them.
My feeling is let's talk about real problems/strengths with the 4runner, not what we wish would happen. The biggest way we can influence a car maker is buy buying or not buying. If you don't like the 4runner, don't buy it. But if you do buy it don't spend all your time talking about what would make it better as you already made your choice, so live with it. Now if something is not working the way that it was advertised to then lets talk about it and figure out how to make it right. If there is an after-market fix that makes a nice difference, lets bring it up.
Write a letter to Toyota if you want to make sure they get it. To expect them to read this forum is crazy. We are only a small percentage of their customer base.