@James *******
, It's not totally correct. When you apply for SETV/METV on eVisa system, you have to provide all travel tickets to Thailand leaving the country you applied for your visa at, NOT from your home country.
When you actually travel, your flight could be different from what you provide for the application. Flights are always changed because of a lot of factors such as airline schedule changes or cancel, and you have no way to inform to eVisa system about this change.