the whole point of the Professionals Working From Thailand LTR visa is to legalise what is already going on, and encourage those people to spend more weeks of every year in Thailand, and of course part with their hard earned cash on Thai goods and services
Also there are many people (often with Thai partners) who work for Corporations overseas and spend as many weeks as they can in Thailand (holidaying and working remotely) - they would also qualify, even if their contract doesn't specifically mention remote working.