Hope you don't mind if I chime in here with my experience. My wife and I just finished our Phuket quarantine. We arrived via Singapore Air, the flight from LAX was about only 1/10 full. Not only was there no one sitting next to us, but no one behind or in front, or even the entire row all the way to the other side of the plane! The entire process to get back to Thailand was a huge pain in the <deleted>, to such a degree that I won't consider doing that again until the process becomes much simpler. Despite getting the process underway two weeks before leaving, we nearly didn't make it thanks to unanticipated consular holidays in the US and in Thailand. One hiccup was my Thai wife did not bring her insurance policy because we believed she wouldn't need to show her insurance, being a Thai citizen. This is not the case, she needs to show it. We tried to get a PDF last minute but the insurance company was gonna take a few days to get it to us, so we had to buy her TUNE insurance online for 30 days, which was sufficient.
We booked a week in Phuket, then four days in Phi-phi, and three more days in Phuket. The hotels were generally proactive about getting us the needed documents. Another hiccup is all the hotels wanted payment upfront, whereas the default scheme in Agoda is "book now, pay later", and that caused us a major delay as we hadn't anticipated that. Once we were all booked and paid, we got our SHABA QR codes right away.
We stayed in fancy hotels which we probably couldn't afford pre-COVID, which was nice. First hotel in Rawai was the most expensive, but Rawai area was pretty dead, despite advice I'd gotten earlier saying Rawai was one of the better areas to book. Very few options for restaurants or shopping, or pretty much anything. Our Rawai hotel had 100 rooms, but only about 10~20 guests total.
After the second day, we realized that booking a Grab taxi to somewhere and back was already costing us more than renting a car for the day, so we rented a car for the remainder of our time there. We drove to Phuket old town, which was very quiet but maybe 30~50% of the shops were open. Patong is a ghost town. Very sad to see that, but very happy we didn't choose to stay there. Jungceylon mall was either closed or dead, we couldn't tell from driving by, as was nearby Central Festival. We visited Central Phuket Floresta, which seemed to be doing quite well.
Next we visited Phi-Phi. When traveling in or out of the Phuket+ area, such as to Phi-Phi, you need to obtain a "release form" from the hotel you're currently staying at. Phi-Phi was dead dead. Nothing going on at all, and nobody around, and almost everything closed. Our resort was 20 something acres and, apart from the first day, we were the only guests there. Sadly, the beach was HEAVILY polluted with rubbish, it appeared no one had bothered to clean it for quite a long time. So we couldn't even get to the water as we'd have to navigate all the rubbish, which was also everywhere floating in the water, so swimming in the ocean was just not gonna happen. Apart from being able to wander Phi-phi without anyone around, which was nice, the weather was miserable, and we both felt it had been a mistake to travel there.
So finally our last three days back in Phuket, this time at Laguna area. We stayed at the very nice Dusit Thani hotel, which was absolutely packed with Phuket+ guests! We rented a car again, and the Laguna neighborhood was hopping, plenty of restaurants and shops open. The rental agent dropped the car off at the hotel and picked it up at the airport on the day we left. Very convenient.
Overall, we didn't have any complaints or problems, everything went fairly smoothly once we had completed all the required paperwork prior to leaving. But if I had just been a tourist, I would have been totally put off with all the forms and COVID tests and other requirements, and would have just gone to ANY OTHER country instead.