All modern platforms have a web version of their product and there is no point in having a special application on your phone. The site is always optimized for mobile devices.Although I'm not a fan of playing on the phone, because for me it's just not convenient, it's much more convenient to play from a computer.But there are times when you can go in and play a couple of games or place bets and the phone copes with its task 100%
Sorry to say, but if you find a computer more convenient than a smart phone in terms of playing games, then you probably don't really understand what the word "convenient" truly mean, and i would advice you try to find it out on your dictionary, if you are someone who does not leave the comfort of your room or house everyday, then you will never understand what "convenient" truly mean, A traveler like myself knows that a smart phone is more convenient than a computer because, most times, some travels require one to carry a very light load, and we all know that a computer is not a light load, and aside this, we can not play games one our computer every where we go, but we can on our smart phones.
It's funny that you didn't forget to write that you are a traveler)Then you can make a trip to the first page and read what the topic was originally about.I expressed my preference in how it is more convenient for me to play and on what.And the author thinks the same.Also in my message it was written : that sometimes you can play on the phone, but it does not bring such satisfaction as playing on a PC, it is about the process of the game.we are talking about different things.
I know what the OP is all about, but you would agree with me that a coin has two sides, and several edges as well, if the discussion on this thread was to be purely based on OP's enquiry, then the first page would have been enough for that since the first page already have all the answers OP was looking for.
However, i understand and respect your point of view, aside not agreeing that computer is more convenient than mobile phone, I forgot to let you know that you are absolutely correct with your first sentences which states that modern websites are optimized for mobile devices, i am a partial web developer myself, so i must confirm that gone are the days when it was a struggle to view websites on mobile devices, with elements like -
Veiwport/Scale
Media Queries
It is relatively easy to build websites that automatically adjust itself to fit whatever kind of screen size used to visit the website, so OP's claim that all casino websites are good on computers and not good on mobile phones is kind of a lie, he would have been correct if he use the word "some", instead of "all".