I always laugh at Warlock dips...
"You know that you sold your Soul for Eldritch Blast, right?
I’m currently playing a sorlock, and I like to make sure the multi-classing game mechanics are supported by the story.
I told the GM the broad strokes of what I wanted for my character journey. My PC would start as a Shadow sorcerer, who’s power came from a failed ritual where he was to be sacrificed as a young boy. In the process, the tip of a strange dagger was broken off in his chest, and he has a wound that won’t heal. While he develops a few useful magical tricks for his initial career as a gang member in the poorer part of town, he was never comfortable with his powers.
After a few levels, he would find a reason to take a fey patron and become a warlock (knowing the fey Courts are of significance in the campaign world). The goal was to eventually get a Book of Shadows, primarily to get a raven familiar to complete his Sandman aesthetic (this was a few years before the current Netflix adaptation).
Then, his patron would do something to betray him. My PC would turn his back on his patron, essentially stealing his Book of Shadows, and embrace his “natural” arcane ability.
Long story short, the GM made all of this into a relevant part of the campaign, and eventually the party actually had to battle my former patron to banish him back to the fey realms.
Did I take Eldritch Blast? Of course, as that’s the main weapon of most Warlocks. I did skip Agonizing Blast though in favor of Repelling Blast, which is way more fun. I also got my raven, so it all worked out.
So, yeah, I think one thing about the current multi-class system is it also opens up some interesting story telling options. My next character, which we’re talking about using the campaign to playtest the upcoming UAs, is going to start as a bard, part of a tavern’s house band, who eventually becomes a paladin of Vengeance. (The party will be based on the image below) I have no idea if there’s a “power build” for a … bardalin?… but it’s the story I want to tell with my character.