I think Daydream Nation was more of the exception, not the rule for Sonic Youth. Most of their other stuff is not as "friendly" to listen to than that album. Although there are some exceptions, EVOL is a nicer listen, less aggresive, but the back half still packs a punch. Their last two albums before break-up had slightly more pop sensibilities. As for DN think the flow is phenomenal from song to song, if you cut "Providence" it would be a flawless album IMO but that track does have some charm. It's pound for pound their best album, no skips.
Also, I don't know if I'd consider SY a punk band tbh. They're more of an Experimental Alt Rock band with background in the No Wave and Noise scenes who sometimes make nicer sounding music. They're very discordant, like you said. But that's what you get with them. "Teenage Riot", "Kool Thing" "Incinerate" are more rare for them even though those songs are very popular.