I have no trust to new casinos. Well, I understand that a casino brings good money to the owner and can become a good business. But the same way new casinos appear and disappear everyday. How to trust them? I avoid new casinos and play only on checked ones.
Mostly I agree with you, but there are some exceptions. New casinos offer different treats to attract gamblers to their sites. They are either the lowest house edge or free rolls or a bigger faucet than on other similar sites. So it's worth to visit the new ones from time to time. Only I wouldn't recommend to fall for a deposit bonus in those places.
New casinos are good to play, and they will come up with new games and new ideas it will impress players. But yes don't fall for a deposit bonus until that site become popular in the market. But old casinos maintained their reputation, and they also improved a lot in games wise and security wise. So I just visit new casinos sometimes, but I will prefer old casinos to play and invest.