90 day e-visa doesn't give us any information. Most Thai visas are 90 days. Visa FOR WHAT? We can't tell you anything until we know what visa you have.
Because they want to make sure they know where you are, and they want to make sure you have the financial means to support yourself annually, so you don't become their problem to take care of.
you're asking about a form that hasn't even started being used yet for a trip 5 months away. Wait until we start getting actual reports from people, and then months for them to make any potential changes. Regardless, it's not going to affect your trip