Trimming is different to cutting, when you realise your ends a ragged or rough, then you can trim it but cutting usually entails cutting more of the hair. Cut only when there is a need (say 3-4months). Black hair grows only half an inch a month so keeping the hair we grow does so much for us.
I cut often because I don't intend to grow my hair as long as I did some years back. Everyone and their choices, the most important thing is we are using chemical free products that feeds our hair to be healthy on the hair and in our bodies.