Lost in the Reilly/Street controversy is that Street was also the producer, and hence deserves credit for putting everything together in the studio and making it work. Even if Reilly is correct, I don't doubt that it was Street who made it all come together brilliantly because he was both songwriter and knob-twister. In the case of "Suedehead", for instance, it probably went like this: Street wrote a decent demo, Reilly made it better, and then Street transformed it in the final stage into a great song. Does Street deserve credit as writer? Producer? Both.
So, while I agree with Maurice that Street's songwriting is missed, what's really missed is a guy who complemented Morrissey as a complete
composer, as Marr was. There were many involved in "Viva Hate", but in essence it was entirely a Morrissey/Street production from top to bottom. I don't think you can say that of the music he recorded after that. Many, many classic songs were made after VH, but I think you can make the case that there was never a collection as cohesive as "Viva Hate"-- and this is one key element that makes it more like a Smiths album than a solo album.
Erm, wasn't the music completely recorded for most of The Smiths songs before Morrissey even got there?
They worked out the songs' arrangements ahead of time, and then the music was recorded. There were many examples, the most famous of which is Morrissey and Marr coming up with the basic version of "Panic" in the kitchen one morning after hearing George Michael on the BBC after a story about Chernobyl, or however the story goes. I think Marr probably came up with the basic structures by sending Morrissey tapes-- i.e. demos-- and then he'd record them in the studio with the band until a version existed that could support the vocals. Then Morrissey popped by, yawning and checking his watch, to create stone-cold modern pop classics in about ten minutes.