I completely agree. There's nothing better than their relationship in S4 lol.
And yeah, that's true. I never thought of it like them turning him into a mini Angel, but now that you mention it, they did. Him getting a soul was an interesting take, and it did offer some pretty good storylines, but I did like his whole "I'm evil I just can't act on it" thing so he tried to do evil things without hurting people, like stealing and annoying them 😂
That's true what you said about prey and predator as well.
All of his story arcs in s7 are just retreads of Angels from s2 and 3 sadly.
Being a vampire with a soul who is in love Buffy is the main one, but beyond that.
He goes evil again (the trigger and the moment of happiness. When they are evil they also turn a friend/associate of Buffy's. Holden Webster, Theresa.)
Buffy's friends think she is losing sight of the big picture by protecting him and one of them works with an outsider of the group to try and kill her vampire beau. (Xander with Faith, Giles with Wood.)
Faith tries to come between them as she likes the hot vampire and is a bit jealous and wants to steal Buffy's life.
There is someone whose family was killed by Angel/Spike when they were evil who shows up and has no solace in them becoming a good guy and tries to kill him. (Holtz/Wood, okay this is from Angel, but still I might as well list it.)
There is a period where the vampire is mad after getting his soul back and Buffy has to tend to him, despite feeling uncomfortable around him after his last soulless bout. (Spike being crazy in the basement after getting his soul, Angel getting back from hell.)
The First tries to **** with both souled vampires through hallucinations, mind games, making them think they've seen ghosts, and driving them back to villainy. (Amends, all of S7 of Buffy.)
There is even an episode where Spike and Angel get chained up and tortured by Drusilla (okay not Drusilla in Spike's case, but the First assuming her form.)
It's the same beats every step of the way, and sadly proof that they had run out of ideas. Personally I don't think any of them were done as well as Angel either. Except that Spike's last moment with Buffy was more memorable. Also the flashbacks to Spike and Nikki didn't have to deal with David Boreanaz' Irish accent LOL. I would have also loved to have seen what Drusilla looked like in the 70s with her punky outfit.
The Spike from S2-4 meanwhile was a totally different character to Angel and in some ways better. He obviously wasn't as good in that he wasn't as developed and couldn't lead a show the way Angel did, but he was a lot more fun, which is why everybody liked him LOL.
He was a self server, happy to stab everybody in the back. (In the s2 finale he betrays EVERYONE. Buffy, her friends, Angel, his fellow vampires, even Dru and walks away scot free.) He was also a more practical evil, willing to call it quits, unlike say the Master who will die for his beliefs. He was also more sarcastic, dry and hilarious too, but could be a more vicious enemy as he knew Buffy and Angel better than the others, and could really hit them where it hurts.
I think there was definitely more to explore with that side of him, and indeed Supernatural would have great success with a similar character, Crowley in its run. Still like I said in S5 and 7 Spike did still bring a lot to the show and his episodes did still tend to be the best ones regardless like Fool For Love, or the episode where Buffy finds out he has been killing people again. What was it called?