I have read with interest the various comments made by naturalised Thais of the injustices they have faced notwithstanding their changed legal status as Thai nationals. My application is still winding its way through the system and it is unlikely to reach a conclusions for at least a year or more. I have been a permanent resident for over 6 years.
One of the frustrations of being a permanent resident is that the status seems to be viewed more as a favour than an entitlement; one is accorded no special rights as a permanent resident other than the 'right of abode'. Owning land is still restricted as is the right to work, etc., etc. More to the point, Thais in general have been led to expect that all foreigners in Thailand need to have some sort of a visa. During the pandemic when the country was essentially closed to international travel, I did not renew my Non-Quota Immigrant Visa, of course - why would I, unless I wanted to travel? One time when I checked into a hotel in the south the staff took a long time to search every blank page of my previously unused passport looking for a visa, to no avail needless to say.
The major benefit that comes of being a permanent resident is that it deprives the immigration department of discretionary powers as to whether or not to renew your visa annually, as far as I can see. It is also preparatory for applying for citizenship unless one is married to a Thai.
I think when one is going to contemplate the injustices that naturalised Thais face living in Thailand it is important to also consider the manifold benefits that come of being granted Thai nationality. It may, therefore, be of value for me to recount one of my most recent frustrations as a Thai PR. I have been looking at interest rates on bank deposits. Most commercial banks in Thailand have 'high' interest accounts to attract and retain customers. As far as I can see, almost all banks have some such offering. Siam Commerical Bank's offering is available to foreigners also, although the high interest rate is only available on the first one million baht. I have enquired of about three or four other banks that similarly offer higher interest rate accounts. They all restrict such accounts only to Thais and upon enquiry they explicitly exclude PRs too, although not naturalised Thais.
We can all probably think of occasions when 'foreigners' have been discriminated against in the various countries of our formative years and it would be naive to imagine that discrimination doesn't show up everywhere in some form. It is a very human condition after all. So, in summary, it seems to me that the benefits of naturalising as Thai far out way any 'minor' frustrations that may come along with it.