Sentimentality is the reality of my sentiment.
My sentiment is the emotional attachment that I have to people, things & experiences.
I attach myself emotionally to whatever feels good for me.
Emotional attachments have value and I value them.
The reality of my emotional attachments is that I need them.
The more that I need something emotionally the more attached I am and the more sentimental it becomes.
Sentiment is a feeling caused by a perspective that creates a belief that is the effect of a personal experience.
A sentiment is a reality when it is a personal experience that is realised and remembered.
Sentimentality is inherently neither good nor bad.
It is just my perspective that is in judgment or not.