you know what youre right. i guess what i meant was i never understood why people are so passionate for it. by and large people can ship whatever they want to a point
^For you I recommend the "Perfect Feet" image pool on Danbooru, I'd link it along with the tag I previously mentioned to someone else, but I don't know if I'm allowed to link to the site since a lot of the art on there is explicit/NSFW. It's an easy google search though.
^They're both "foreigner" class servants and connect there, there's also some official interaction between them (dialogue/lore at least). Basically Abby likes to watch Oei (Hokusai) draw, and is a bit jealous of her drawing ability. Oei I think finds Abby to be interesting as well, and there's a fan-translated line on one of the game wikis where Summer Oei says Abby looks like she'd grow into being a beauty. Additionally they're designed by the same artist as well.
^I think the ships are good if you make your own canon and lore, or/and follow fan-fiction lore and head canons in the community. Which I'd argue is kind of what people had to do, because of the official interactions being well as you said, a bit anemic to say the least.