Using a 2018 13" mbp (i5) with the LG works quite well, but I'm not editing music or videos at any significant level. Basic trimming of videos or doing minor photo edits doesn't seem to bog anything down.
I do see a little lag when dealing with animations etc - for example, when invoking launchpad, which I use frequently, it lags a bit, but not all that bad. Overall, the new 13" mbp is quite capable, but does still lack the 'grunt' of the 15" that I also use (2017 - i7).
I would never intentionally diminish anybody's use requirements as it relates to their choice in selecting the appropriate laptop for their use. But, I must say that I think the concept of 'over-speccing' is, to a large degree, an antiquated concept considering the level of computing power that has now become the norm (i.e., capacity has risen to the point of diminishing returns pending the next 'leap' in technology). Everything in someone's life doesn't necessarily need to be 'super-sized". JMO so take it for what it's worth.
Good luck..I love the 13".