Hi Frank -
I think you will find that most of the responders here are in the same age range, give or take, as yourself. So, no surprise that anyone's tastes, myself included, may have changed or matured over the last 50 or 60 years.
I own a lot (and I mean a lot) of recorded music and what I have found with my own listening is that if the music catches me, I may not notice the lyrics until after several listens or if I force myself to read a lyric sheet. Music does have to grab me though.
As for repeated phrases, if I like the music it doesn't bother me, if I don't like the music, then it becomes another reason to dislike it.
Your third point quite frankly makes me go ... 'meh.' So, a better singer might do a better job of a song, than a not so good singer. Just that the not so good singer may have a bigger ego or higher estimation of their singing abilities or better production. Like American Idol's practice of the top two season finalists singing the same song (A Moment Like This) and you wonder why anyone would vote for Justin Guarini over Kelly Clarkson? How long did that last?
Admittedly, I don't like lazy songwriting. I like clever wordplay ('How Can I Be Sure'). Creative is good too ('Don't Think Twice, It's Alright' comes to mind, then again most anything by Dylan). Doesn't always have to make intuitive sense to be good ('While My Guitar Gently Weeps'). Can be fun ('All That Meat and No Potatoes'). I do tire of songs that don't tell a good story or make a point or make my head hurt (anything that J Lo sings, has ever sung, our ever will sing).
Could be they just don't write them like they used to. Or as Popeye might say ... I know what I can stand and I can't stands no more. Life is too short. What do I know anyways?
Rich