You can apply Lumetri as a master effect, that'll carry over to all instances of that source clip
Micro four thirds has plenty of lenses designed with the 2x crop in mind, such as 7-14mm. If you can find EF lenses like that then you are good, but you can't.
If anything this is the worst camera for vlogging. Vlogging needs wide angle, with the 1.7x crop you can't get a decent wide angle, a 24mm becomes 41mm...
the best one i've used is the singh-ray. expensive but head to head is better than the tiffen, which i also have, and both are better than the lightcraft workshop variable nd.
out of all three, for best quality i'd use singh-ray, but best value is tiffen.
I think the 31 mph smart mode in the article is actually the sport mode