Actually 4 casinos:

Trump Taj Mahal in 1991, Trump Plaza and Trump Castle in 1992, and Trump Hotels & Casino Resorts in 2004

Then you purchased a wrong game and should just play solitaire.

Witcher 3 is absolutely great, but if you just go through only the main quest, won’t explore the world and won’t do side quests then I can see you ending up disappointed.

What I like is that side quests can impact the main quest and even the ending.

No, at least not during this period. If it was invented right now, or is guaranteed to be only controlled by oligarchs and ruin life of everyone else.