sawasdee, hello, oder gruezi mitenand, rene=(khun or nong?) sombat. Nice to see that more people share this interest in the Thai transport scene. Sadly this is my last day this winter in BKK and have not much tme-follow up later.
However, now that the nr of Chinese (assembled in Thailand-the former Tv factory in Rayong) is slowly growing further-not just the yellows here in BKK but also with various other private operators around BKK- I doubt if your points 2+3 are still valid:
the chinese buses are cheaper-and the quality is-for this latest generation-not necessarily less. What I also discovered during recent trips in China itself. The private rot ruam operators clearly always know where to find bargains. But of course none can compete with the Swisstrolleys and other Post buses that easily last over 40 years.
Yes, those seats are not the most comfortable-but thats about the easiest thing to change, I think.
PS; there is also thaitransport.blogspot.com