If they thought it through they would have created an app or at least the account could store your key details so you only have to enter the flight details.
Cambodia has an app for this and it works very well
fair enough but retirement with multiple entry stamp over 5 years is still more expensive than DTV and no need to visit immigration ever if you travel as I do
to say you save nothing over 5 years with the annual cost of renewal and the multi entry permit is of course incorrect.
I personally travel every couple of months outside of Thailand and historically had to plan to be inside Thailand to renew. The DTV allows me to do as I wish for 5 years without ever having to visit immigration, which again is another cost in both time and expenses. So for me the DTV has many benefits over the retirement visa