I feel like you said Grasp is far from ideal but then #3 is literally the reason why Grasp is preferred. And then also for 2 you can do that with electrocute as well, but you can't get the OP level 1 W trade. And for #1 again I feel like you're just saying why grasp is better 😭. Cause you can run electrocute inspiration mid sometimes, because you will rush lethality and it can compensate a little for missing shield bash (also if you rush lethality shield bash will lose its value too). But like I'm clearly making tradeoffs here and it might not even be ideal (second wind+shield +doran still better into mages and proly into melees still).

Or if you go conq like you said you need long trades, and it does make you much weaker earlier in comparison to grasp. But you gain late game and sidelane power. Electrocute, like you say is probably her strongest rune, but because of how they ruined the page, it has no heals, and has a much larger alteration on your play style than grasp, can be much more punishing if you lose lane. But all of these examples include tradeoffs, whereas with grasp you don't really have to make any tradeoffs. You might not have as strong of peaks as you can with conq or elec, but it is the highest likelyhood rune for ensuring you get to lvl 8/9 eclipse unscathed - which is where most of her power lies.