This probably also depends on your core business. If your product does not deal with real money, crypto, or other financial instruments and it is not serious if

This probably also depends on your core business. If your product does not deal with real money, crypto, or other financial instruments and it is not serious if something goes wrong with a small number of people in production, this may work for you. It is probably cheaper and simpler. Lots of products are not like that. I built a bank and work on stock exchanges. Probably not a good idea to save money by not testing as people get quite annoyed when their money goes missing.