Is a baby cot necessary?

I find a bedside bassinet / cot useful, for better peace of mind. Those that come with wheels are versatile, especially for daytime naps. I have had a bassinet, travel cot and proper cot, hand me downs as well as purchase 2nd hand. my baby has outgrown the bassinet and sleeping in the travel cot by my bed. the cot functions more as a changing station for now, she will eventually upgrade into it when she is ready to sleep in her own room.