Does using a fast track airport service guarantee a hassle-free entry? Or is it still possible to be taken away for questioning if you have an extensive visa history?
They usually don't give sh*t to people of retirement age, because they have all the rights to stay in Thailand long-term. Younger folks is a different story.
The problem is that they understand "greatness" in totalitarian, communist and military terms. Not in terms of human rights and freedoms or economic prosperity.
https://www.limousine.in.th/fast-track-immigration.php - shut down
https://www.klook.com/activity/11690-suvarnabhumi-airport-immigration-fast-track-service-bangkok/ - does not accept bookings