1. Gambling using bitcoin is fast, you can deposit amount, withdraw your funds, faster than other platforms available.
2. When you are gambling, one thing you consider is your anonymity, and with bitcoin, you can play no matter who you are, with you identity isn't at risk.
3. Games from cryptocurrencies are probably fair, you can guarantee that you can win with a 50/50 chance.
You've said it all already the reasons why Gambling online using crypto is better for gambling physically / casinos.
Even though there are many advantages of online gambling, there are still some gamblers who prefer to gamble on casino for some reasons like they want to be with their friends who are gambling too. The feeling of gambling in an casino is a reason too. Maybe they are more comfortable when they gamble in casino rather than gambling online and the socialization is very different. You can speak with people in a casino personally unlike in online gambling which is you can chat thru chatbox.
Anyway, with the current event that is happening (COVID-19), this gamblers may prefer gambling online than in the casinos right now and they will go back there as the virus is controllable already.