I'm not sure what the fluff is for why Arcane Tricksters and Eldritch Knights don't have the ability to learn spells from scrolls, but they don't in the tabletop either despite being Intelligence casters and explicitly described to be practicing bits of wizardry by default.
I think its more they are melee fighters that know a few spells.. they focus on melee not spells so they have no time to specialise in mage work..
