I always gave a ticket, so just figured why not. Maybe next time I wont offer more than requested (but I have been in and out a lot on Visa Exempt entries so figured a ticket home would help since that is where I am going next) ¯\_(ツ)_/¯
Yeah, I have flexible flights booked (with points). I knew Vientiane is fairly strict so figured it would be best just to show what I have planned. 95% sure I will use them but was a little surprised when I saw the note. Wasn't sure if it was common, something they would check on, etc.