I did this for a while after being bitten a couple times for not having a credit history.
However, I recently stopped. I still keep one card around and active just to maintain my score… just in case. However, spending $10k for $200 in rewards… I don’t really care. That’s mostly a tool to get people to justify more spending.
I’ve quite liked using the debit card and seeing the number go down when I spend, it makes more sense intuitively, and I always know exactly what I have. I had a debit card stolen about 20 years ago; I was able to get the charges reversed, no different from a credit card in my experience. It’s on the Visa network.
I would cancel my last credit card, but I don’t want to deal with cell phone deposits and other nonsense, like I had to in the past.