Massive risk without it. even if you put money aside, could clear out your savings if a serious issue, There are companies that will pay out as long as you are honest in your medical history. I had an issue 4 years ago and my company paid out as per contract. If you have millions of baht you can put aside then ok, and 3 months isn't long but it only takes one situation. Maybe worth the risk, but a big risk in my humble opinion.
I am not saying the visa isn't any good but any visa which involves having to leave and re enter every year needs to be thought about carefully. What if you don't want their jabs which some countries would insist on when stepping into their country, should it be made compulsory and knowing the way the WHO works, and they have many countries in their pockets, it can make life difficult. Lots of hypothesis, i know, but in these crazy times, nothing they spring on us surprises me. They are already trying to blow up this MPOX nonsense into something big.