Greetings, all! By RAW, enlarge person shouldn't change my land speed (like from going Medium to Large) but it does. This seems like a handy T+ house rule.) (As an aside, may we also get a T+ 'house rule' that changes the Spellcraft DC for learning spells to 0 or something guaranteed? Learning spells from scrolls should be automatic, and taking 10 on this is RAW, but not supported by the engine last I checked. I know I can save/reload or use DM Mode to guarantee rolls, but I'd rather not need to. Thankee!)
Learning a spell from the spellbook or scroll of another wizard never was an automatic success - and it should not be. https://www.d20srd.org/srd/skills/spellcraft.htm However it should not be a problem to have your spellcraft skill on the maximum for your level as a Wizard. Or to temporarily raise your Intelligence.
@ConjurerDragon Adding spells to a spellbook, assuming you're an INT-based caster who maxed INT, is totally intended due to taking 10. For example, Gimble the 15 INT Wizard1 has 4 ranks in Spellcraft for a total of +6. He can automatically succeed in adding any level 1 spell to his Wizardly repertoire by taking 10. This is on the low end. Considering most player-built Wizards start with 16+ INT (and often max INT for their race) and max Spellcraft and ther INT, possibly also gaining items or feats to further boost Spellcraft, this check is a poor holdover from 2e rules about Wizards learning spells from scrolls.