I'm not scared of them, but they irritate me.
Since I am a Rosalina main and that is obviously gonna inspire salt in some people, let me be clear that I actually think Rosalina is better overall now than she was pre-1.0.4. Her skill floor got much higher but so did her skill ceiling with the changes it brought. Those changes are actually part of why I am able to develop a certain tech I have been working on for her (I have not revealed it yet, and won't be doing so here. I'm working on a video for it though. It will be done when it's done, I don't have completely free time to work on it).
Most of the nerfs she got felt like pandering rather than actual necessary nerfs, and didn't really effect her in the hands of an actually good player, such as the constant shifting around of Luma's HP, or the Luma respawn timer extension. I was already good at protecting Luma and making him last before that patch. The patch only encouraged me to get better at it (and gave me tools to make it easier, such as Luma Shot getting faster recovery time, being given more variance in the charge, and the Luma callback animation getting faster and getting a little windbox).
Most patches have been like that for characters - changing and shifting around random things, but not making any meaningful change. I personally think the high and top tiers are fine as they are right now, even Sheik and Rosalina. What I want to see is lower tiers getting buffs, and see how that improves them. Charizard, Ike, and Link are prime examples of the balance team doing things right. They got buffs that were a big deal and really improved them. decreasing or increasing Luma's HP by 3 or 5 is not a good example of balancing. Changes like that change virtually nothing and come across as "oh well people want Luma nerfed, so obviously if we just make a small change that is technically ever so slightly a nerf even if it is inconsequential, people will be happy, right?".
Also I feel people have become too reliant on patches. I stand by that pre-patch Diddy was a surmountable problem for the community. I personally never had trouble with him as a Rosalina main, and Rosalina mains always complained about him. That has to mean something. I seriously think Smash 4 players are lazy, and also rely too much on what "top players" say (which is stupid, because they thrive on meta stagnation). Why get better with a character when you can just wait for Daddy Sakurai and his team to nerf the characters you have trouble with, or buff the character you are subpar with? Granted, there are some characters that deserve buffs as they have obvious non-sensical deisgn elements, but people are too quick to ask for buffs and nerfs before really trying to get better at the game.
TL;DR they don't scare me but they kinda make the game less fun to practice and discuss in a competitive context.