It does, look at the installed ram and the sticker on it.
As for the theory that of many fits one, fact I feel that that is false. I could have bought my college's laptop which is gaurenteed to fit everyone, but I found it wasteful. Yeah the tech specs are better than the laptop I bought but it wasn't good for me, not enough mobility, too big, useless features such as the high end processor that isn't worth the cash tradeoff, etc. I don't need that. Customization is good, example Apple's displays aren't changeable to a higher resolution. That pisses me off 15.4 inch laptops should be able to handle 1680x1080.
2. The sticker refers to ITSELF, not the RAM module. I've seen it on numerous third-party computer components, including RAM and hard drives. It contains information on the date and location of manufacture, and the manufacturer of the part needs that information to track consumer-discovered flaws.
Were Apple to put a removal notice for the RAM component itself, it would attach to both the RAM stick and the motherboard, so that removal would be evident.
3. Apple specifically states that HD and RAM upgrades may be done by consumers without violating warranty.
I have a new MacBook Pro (the SD card one) and it has instructions in the manual IT CAME WITH on how to replace the RAM and hard drive. Apple wouldn't give you explicit instructions to void the warranty. Replacing RAM or hard drive does NOT void the warranty.
So I take back the implication that the t400 is not well designed. ThinkPads have a good reputation for hardware design, which I assume is well earned (have not owned one myself). The same cannot be said for all PC laptops. And software is a whole other matter altogether, of course.
As for customization, Apple deliberately restricts the options for customization relative to other vendors. They definitely have an attitude of designing a few models that fit the needs of a many customers, as opposed to many models each appealing to smaller, more specific groups.