Yeah, as I said, I'm not arguing or debating - just adding or clarifying factual information.
No need to be verbose; just clear. For example, if what you're saying is that the only use of cantrip scrolls is (in 5e) or should be (in BG3) for use by casters for whom the spell is in their list but not known by them, then it would have been very simple and clear to just say "Yes, that's what I meant." when the statement was put forward. Simple and clear.
GM4Him has stated her thoughts and opinions on a number of topics, and you've stated yours on a number, several (though not all) of which overlap. It also seems like, of the points you're overlapping your opinions one, you both agree on a large percentage of them, though again, not all. It seems clear enough that you both view certain key things in fairly different lights, so stating your differing opinions and acknowledging each other is probably as far as you're ever likely to get ^.^
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I'd be willing to bet that a fighter that "splashes" rogue for Arcane Trickster would short circuit GM completely. Assuming, of course, that that's even possible in 5e.
I doubt it ^.^ Since that's an investment they have to actually make, after all; they're giving up their fighter progression to take rogue levels instead, and gaining that value, and it's fair - GM4Him's main gripe on this particular score is largely about the dilution of class individuality and blandifying of all classes by way of creating a more extreme power imbalance accessible to any and every character, regardless of their actual investment. Namely, BG3's excessive item utility and access drowning out class features.
It might interest you to know, as an information aside, UMD is not only Rogue restricted, but it's a perk specifically of Thief-rogues (not Arcane-trickster, in fact, surprising as that may seem) in particualr, which is one of their subclasses, and is not accessible to any other subclass of rogue. The perk itself only comes in at 13th level, as well, so it's a powerful boon that really identifies thief rogues specifically, now, rather than being the "everyone needs ranks in this always" skill that it used to be in 3.5.
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Personally, I like it being tightly restricted, but I don't disagree that it's something that feels like it should go to bard a little more than it does rogue. I'd like at least one bard subclass to get it as well, or a version of it.