Without telling us what visa you have we can't really give you the proper information but based on what you have said I would guess you obtained METV (Multiple Entry Tourist Visa). This visa is valid for 6 months and allows you to enter Thailand multiple times during that 6 months, each time you enter you will be given an entry stamp which is valid for only 60 days, this however can be extended for another 30 days. Once your allotted time has expired, you will need to leave and re-enter Thailand. If it is indeed a METV. When done correctly you can get nearly 9 months of stay with an METV.
you can swap the physical sim but you can only use physical sim cards that are from the carrier. However you can pay about 30-40$ to unlock the phone so it's open to all sim cards.
I leave the country regularly and forget most of the time upon returning to do my TM.30 and ive never had an issue in any of the provinces I've lived submitting a late TM.30, my recent one I left it for 3 months and only submitted it on monday just gone without issue...
it's very true. Even going to BOI route you cannot own land without owning a business with a legitimate need for that land and if you own a business that has legitimate need for land you are still heavily restricted on what you can and can't do with said land and the land is not registered to you, it is registered under your business, you can also lose the rights to that land for breaking any one of the conditions or restrictions.
every country you go to expects you to know their laws especially one's around immigration. No country will spoon feed you what you should have already researched yourself
I highly suspect theyve bit off more than they can chew and it will end up like other systems such as Malaysias. Just a notification into an automatic system and that's it. No acceptance, no rejection. When you arrive if your passport flags an issue you'll get booted from the gate and sent to an IO manning a passport control station just like in Malaysia and other countries.