Interestingly I used to believe this, to the extent that I snubbed my nose at fresh peas in pods being sold in various countries I have lived in. I can't remember why, but I bought some last summer, and it was one of those moments when I realised how wrong I'd been. Frozen peas are a pale imitation of fresh peas. There is more variance - sometimes you'll get a pod with quite mealy peas, especially later in the season, but they're otherwise so good it makes up for it.