Smell that burning? It's hot take time!

"Anything shonen does well, magical girl anime do better"
No it really doesn't, Magical Girl anime follows a different set of rules, the main difference is as Megamind calls it presentation, for example Sailor Moon's most memorable battles are usually the last episodes of the current season, in comparison Dragonballz have big long battles but some of the most iconic moments such as Goku and Vegeta's first beam clash wasn't even the finishing blow, some exceptions do exist but skew the line of the genre.

"I despise hearing Hiroshi Kamiya's voice"
Let's see a selection of his work.

Some decent performances there, not seeing why you hate him.
Real talk, It's difficult to judge a foreign language from the point of view of a non native speaker, I have plenty to say about the dub casts but the original Japanese voices not so much.

"Death Note would've been better through L's perspective"
Fairly convinced they've already done this but to answer the take, L isn't strong enough to hold Death Note together as a lead, the whole appeal of Light is that his practically childlike take on morality is what makes Death Note such a compelling story from his point of view because at no point does he consider that what he's doing is wrong.

"Most mecha shows would be better if they just removed the mechs considering how little they actually mattered"
I wouldn't say most but there are a few examples of mecha being added as an after thought, Rayearth, Code Geass, Nadesico and Escaflowne all spring to mind in this regard but at the same time, said shows would barely get off the ground without some thing that could be marketed as merch, like it or not it still has to make money.

"Infinite from Sonic Forces was a good character"
No, he was awful! It's the absolute culmination of god awful edgy 2000s and the absolute worst of fan character culture, how can anyone look at this jackal thing and not cringe from how hard he's trying at being an edgelord only to be humbled by Shadow the Hedgehog.