Eh...that's like asking to describe why I like my favorite food over my least favorite...except not as profound. I connect to it more...I enjoy the melodies and tone and groove of songs from TKOL/Amnesiac (even though in years they're far apart...I find Amnesiac and TKOL have more in common than say, IR and TKOL). Yes, they're simplistic, electronic, and at times repeating evermore...that to me is not a negative and it isn't something I view as, "He used a computer to create that, so it's worse". I just listen to it and I like it more. I'm not sure how I can explain that..
Lyrics are a hit or miss with me, as well. Sometimes, they're a huge part of the song and I care greatly for them; other times, I couldn't give a shit less what the singer is saying if I like the beat and melody enough. In the case of Amnesiac, songs like 'Sardines' and 'I Might Be Wrong' connect with me lyrically, but I also love the entrancing, hypnotic beat to them. I'm big on the whole psychedelic side of music, which is also why I prefer the first few albums of Porcupine Tree to the newer, rock-oriented music of theirs. The zany, out of the box stuff simply 'speaks' to me more.
That's the best I can explain it... Which I know wasn't very well but...again...it'd be like me asking you why you don't like TKOL and love Bends (or why you like your favorite food and hate whatever you can't stand to eat). I mean I've read enough of your posts to know a bit of the reason, but these aren't facts we're stating here...it's very personal and intrinsic and almost impossible to convey to another. Like me asking you to describe what the color 'red' is to you...we both know what 'red' is, but it's completely and utterly useless to attempt to describe it to one another because our 'red' may be different without us even knowing. I mean, I know I'm getting into something completely different here, but it's very close...we all hear things differently in terms of how our mind connects to it and enjoys certain sounds more than others. I like the sound of 'Feral' much more than I do than 'Fake Plastic Trees' (and yet I absolutely adore 'Bullet Proof' over almost anything else they've created). I will never be able to accurately explain that to you in a way that you'd understand because clearly you aren't 'hearing' what I am... I guess...
I dunno man... I'm an ass guy.