I dunno why - but the length of time taken at F check-in is not unusual to TG. I find most First class check-ins around the world seem to have the slowest passengers... or staff... its hard to work out who slows it down...
Maybe F pax are trying to get away with more luggage, or with tiny cabins they are trying to get two seats together? Or confirming special meals? Whatever... with the exception of CX in HKG, I have waited longer than biz class pax at many F check-ins.
As for hot towels and drinks... the hot towel at BKK is nice to clean your hands and face. I can happily skip the drinks.