@Pilat You need to get out a bit more I think and stop philosophizing about all the garbage you read somewhere on the internet. You got a lot of angst built up and some fresh air will probably do you good. Your arguments have many, many flaws in them with broad assumptions and disregard for a host of variables. It makes most of your statements either entirely false, or only minimally accurate at best because of all the other factors you ignore. You can theorize all you want on the benefits of IFS vs solid axle. The fact is there are limitations to both (you know, because of physics). But a wholesale dismissal of a solid axle because you *think* IFS is superior is ignorant. IFS can definitely be preferable in some situations. Solid axles can still outperform IFS setups in a number of areas BESIDES rock-crawling. I'm not even going to put rockcrawling into the discussion since there is a general consensus on the matter. But the only one with a disconnect from reality in this discussion is you I'm afraid.
I have owned many Solid Axle and IFS vehicles that I've used extensively offroad in nearly every scenario possibly encountered. I've raced in the Baja 1000 in an IFS Toyota Land Cruiser, and currently drive a 80 series solid axle Land Cruiser. I've owned a Land Rover in the past as well (Discovery). I feel like I can speak with a reasonable degree of first hand experience and not merely physics textbook calculations. Physics are a real thing, but in real world scenarios those same laws of physics, while constant, respond differently to different variables. Or should I say, vehicles employ a number of variable to manipulate the laws of physics to work in their favor. Simply saying that IFS is superior, period, is idiotic.
My current vehicle is a prime example of what you would describe as a worst case scenario. Solid front axle. Lifted. Big tires (37's). Factory sized brakes. I would invite you (genuinely) to join me on one of my typical offroad trips (not rockcrawling) but covering a lot of ground and fairly high speeds over a variety of terrain. Please bring your ideal setup, IFS, not lifted, standard size tires as the engineers intended (albeit any type of tire you want) and I'm confident you will not keep up. I'm also confident it can be done with better ride and comfort than you'll experience. Heck I'll even put the roof top tent on top of my too tall Cruiser and be at camp hours before you get there. The capability you seem so confident in will have a day of humility I think. Honestly. If you're able and willing to come to Utah, I'd love for you to join me. I'll show you some neat places.
You mentioned suspension travel being only a real factor for rockcrawling. It seems to me you have not experienced the benefit of ample wheel travel on simple dirt roads.
Here's one example of where wheel travel is a plus outside of rockcrawling. It doesn't have to be RTI ramp poser amounts of wheel travel, but a well set up 12" of useable travel. I've done this with a unlifted IFS vehicle as well and I'd be happy to demonstrate with you in the vehicle which setup is preferred. Hint, the lifted solid axle one every time. Typical IFS vehicles, even modified ones will struggle to have 12" of front wheel travel unless you start looking at race setups.
IMG_8007 by
Adam Tolman, on Flickr
IMG_8009 by
Adam Tolman, on Flickr
IMG_8010 by
Adam Tolman, on Flickr
Now, for the record, I'll repeat a point I started with. IFS *can be* superior in some situations and a modified IFS suspension *Can* outperform a modified Solid axle but it all comes down to components, and a bunch of variable you refuse to recognize.