alpaca I knew a woman who had her DC removed by SS because of lifestyle choices she'd made meant the DC was at risk of emotional neglect. They didn't even wait for it to inevitably happen.
I think it's serious because it can affect your entire life and the choices you are able to make. It's hard to explain but the best I can do is to say that emotional neglect or abuse, as well as other forms of neglect and abuse, causes your brain to be somehow incomplete/faulty and so you believe things that aren't true, like not being horrified at the situation you're in for example, that leads you to being unable to make sensible choices as an adult because your definition/understanding of what is sensible is twisted/wrong/messed up.
That doesn't mean it's not your fault or responsibility to live your own life as an adult, but it can mean you're at a disadvantage when it comes to having the ability to live your own life in a healthy way. Taking responsibility for yourself might mean needing to change, to see a therapist or read self help books, so you can understand where you're going wrong and choose to do things differently. Whereas someone who never experienced neglect or abuse starts life from a foundation where that work isn't necessary because their brain developed as it should so their ability to make decisions hasn't been compromised.
Of course the problem is many of us don't realise we've experienced neglect or abuse until we're well into adulthood and our life has gone tits-up repeatedly. Or we've had DC, look after them reasonably well or at least better than our parents did us, then in spare moments reflect on our own lives and think WTF. We can do all the work on ourselves that we want or feel necessary, but regardless of the impact of that, we can never get back the time which we wouldn't have lost to unhappiness as an adult if we had started life with a better foundation. We also can't get back the time we should have had as a loved and contented DC who felt safe and protected in the world.
I think it's ok to be pissed off about that. Just so long as you deal with your emotions and don't let them consume you so ruining your life even more. The bitter and twisted, chronically angry, jealous of anyone they perceive as having something they don't, filled with hatred or with a permanent negative outlook - those people aren't living their best lives, they're not happy and by this point it's their own emotions that are sabotaging them most.
I don't think there's a linear measure of "this neglect/abuse is worse than that neglect/abuse" therefore people who experience the former now have worse lives than those who experienced the latter. It doesn't work like that. I see it as dysfunctional to think that way, sort of gaslighting ourselves. Like it wasn't "as bad" so we "shouldn't" be as affected as someone else. I kind of think it's all equally as bad because it all equally has the potential to mess someone up to the max.
I think the things that make a situation less bad are not the form of neglect/abuse but the mitigating factors (I don't think that's the right wording but it's the best I can do). Like if you had shitty parents, but a fabulous well rounded person for a grandparent who you spent a lot of time with outside school, then you'll have a different foundation than someone who was in the company of the shitty parents 24/7 because they had no grandparents and were homeschooled. The two people's brains and lives could turn out very differently although the shittiness level of the parents was exactly the same.