@Frank-Steven **********
It is 5 years, not 5.5. It is not guaranteed now that you can use it over 5 years.
It is designed to have digital nomads frequently visiting the country ion a period of 5 years, but not to facilitate people to live in Thailand full time.
There is a reson for a stay duration of 180 days, but a lot of people just don'tr want to understand the meaning of that and use border bounces to trick the system. Border bounces are completely legal, but it is a loophole to trick the system.
When I am on workcation, why should I be denied to travel out and not be allowed in because they made the visa single entry like you propose.
And why should I as a digital nomad not have the possibility to get back to Thailand after I left some months to work in another country.
The intended use of the DTV is not the problem, but the people who are to stubborn to get the visa that is intended for their purpose of stay, or people for which there is no matching visa, because Thailand is simply not interest in them to visit the country.