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.
Anonieme deelnemer 418 Why should a tourist only stay up to 30 days? Living the year around on a tourist visa indeed is not how it is meant, but creating complex checks only because there is a group that is too stubborn to choose the correct visa, matching their purpose of stay, also is difficult.
When they want people not whole year around but only for regularly stays of up to 180 days but not back to back would be difficult.
Anonieme deelnemer 172 Personally I did not find immigration offices unhelpful about DTV. Just out of curiosity I asked them how the extension process would work, and they just answered friendly giving details needed.
If they really hated it, I would expect them to advise not to extend.
Where did you get information that DTV is a 5 year visa that wants attract people stay long term?
Official info is completely different, the default stay is 180 days, so not long term.
If they would attrect long term staying people they would have made the stay 1 year like existing real long stay visa and give the possibility to extend that stay as many times you like.
So your idea of what DTV is designed for is completely wrong, for that purpose they already have LTR, Elite and non-O visa.