Being nice is all about making the other person feel good. Being kind is about providing them with what they actually need. Nice is about feelings. Kindness is about concrete help. And if you want to do great work together, you should aim to be kind rather than nice.
A company isn't a family. Parents don't fire their kids for low performance or furlough them in hard times.
A better vision for a workplace is a community—a place where people bond around shared values, feel valued as human beings, and have a voice in decisions that affect them.