you can lease the land for 30 years OR for the remaining time of your life. There are a lot of us who own/lease property here. The naysayers are typically people who cannot afford to do it, but there are foreigners who have been doing it for decades. Some people do it through Thai companies, which are a lot more complex and require a majority Thai shareholder and some additional steps and costs so as to not make it a nominee shareholder, which is not allowed by law. There are lawyers who are honest and can help you with this.
There's an LTR visa that gives you 10 years if you buy/lease property that is over $500k and have an additional $500k in assets. The visa is presumably renewable every 10 years, but it's only been available for a year so I can't say that for sure.
Corporate tax withholdings. I thought that was obvious. It obviously doesn't work for everyone. But, there's certainly an argument to be made for some employees that working from TH on LTR is not considered Thai labor and therefore the foreign employer shouldn't pay local rates because the employment isn't considered Thai employment under Thai laws (LTR work from TH). Again, this kind of privilege wouldn't be available for lower salary or early career. The situation is for unique situations, but that doesn't mean we should ignore their existence.
there are lots of employees who are internal function employees unrelated to sales or direct revenue. I can’t comment on UK or anything I haven’t specifically read, but I certainly have an analysis on the Thai regulations and many internally functioned employees can work remotely here without triggering tax withholding. I do, however, think that as LTR evolves over time, there will be clarifications in the regulations that make the analysis easier for employers to consider. I can promise you that I know a senior manager of a global company in Thailand working remotely who has absolutely zero chance of being involved in PE.
there are employees here on it. I’m a lawyer. I understand what you’re saying, but there isn’t a risk with a lot of work. Some employees are very senior. Some are long term loyal employees. BOI won’t get close to a million on LTR, but the assumption that no employers would be willing to allow employees to live in TH is already proven wrong.
The Royal Decrees are on the BOI site translated to English. As long as you are only doing remote work for your company and the work and company have no contacts or clients in Thailand and you don't set up any sort of office, you should be ok, but your company should probably get the analysis done regarding permanent establishment and ongoing business, because it would subject the company to tax withholdings. If the company meets the 150M requirement, I'm sure it can afford a small fee to a Thai lawyer for the analysis.
Your landlord has to register you in the system for TM.30 and then send you a screenshot, which you take to immigration office with a copy of your passport photo page, a photo, your passport, and they will issue the certificate of residence.