I am but a humble Shrimp.

[Dragon Lord]

I have used magic builds in Fromsoft games before. The Dex/INT build is probably my all-time favorite in Dark Souls. Crystal Magic Weapon on a Painting Guardian Sword absolutely shreds bosses, and for when you don't feel like doing melee and just want to 1-2 shot a boss, you have Dark Bead at your disposal too.

I don't remember if I've ever done an INT build in Dark Souls 2. I was more about Faith in that game, because you could buff elemental weapons in DaS2, so dual-wielding Lightning Rapiers with Sunlight Blade was ridiculously overpowered (also thanks to the powerstance system in the game). It was also a HUGE pain to get some of the better spells in that game (Crystal Soul Spear was locked behind beating the NG+ version of one of the bosses, for example).

Never did an INT build in Dark Souls 3. I didn't like the switch to the MP system and having to split your flasks between healing HP or healing MP. Also with how much faster the combat in Dark Souls 3 felt compared to the first two games, I just felt like going pure melee was the #1 way to go in this game. DEX builds really shined in this game for how fast you were able to play with them. Don't think I ever even did a STR build in this one either. It's always DEX build or Quality Build (equal amount of STR/DEX).

Bloodborne's "magic" system was butts and I never cared to use it and never will care to use it.

My first character in Elden Ring is a DEX/INT character as well, utilizing the wonderful Moonveil katana with a plethora of spells to back me up. I went with this build first because I figured magic would be really fun in Elden Ring, and it kind of is, but at the same time a lot of the spells are super underwhelming, and the best one of them all (Azure Comet) basically begs you to use Mimic Tear so that the boss won't interrupt you using it/will stay still more, and I just don't really like that. I started my second character to be a pure STR character using the Greatsword, and so far the game has been like ten times more fun for me this way. Normally I'm not a fan of STR builds because I prefer speed over one big hit, and Dark Souls 2 was the only other Souls game that made STR builds fun (thanks to Powerstancing dual Greatswords -- another thing these two games have in common, the Greatsword is OP as fuuuuuuuuck). Elden Ring has now made that two Souls games that I seemingly prefer STR builds over any other (I'll have to play with Dex builds a bit more to be sure though, a Dex/Faith build might over take it).

As for Demon's Souls, I know magic is pretty busted in that game, but for whatever reason I never really felt the need for it. Maybe because overall the game doesn't offer many challenges, so I never felt I needed the extra punch. I prefer to fun a DEX build in that game too, especially since Bows are actually pretty godly in that game thanks to the Thief's Ring (lowers the range at which enemies can detect you) and the Rat Ring (huge damage boost when in critical HP). These two rings combined could make it so you could kill all enemies in a level in 1-2 arrows, and even made it super viable to use a bow on bosses. Demon's Souls is one of the two Souls games I completed a "bow only" challenge run in (the other Being Dark Souls 2 which also made bows REALLY good).

As for the Yomari games, yes, I know about them. I have the Limited Editions for all of them, haha. I just haven't gotten around to playing any of them yet... on the backlog that is probably impossible for me to complete in my life time at this rate, haha.