Having seen how the original LCA team seemed to have somehow made mistakes on its area-ruling (ref. that ADA document floating somewhere which mentioned a plug to reduce drag), something that is very fundamental to a design, and how that went through all design reviews and wind tunnel testing, only to be found and pin-pointed at a much later phase, I wouldn’t put it past designers (of any nationality) to overlook something that may appear obvious to someone looking in from the outside.
No doubt, but isn't the person who passed that comment guilty of exactly what you pointed out earlier - making an engineering judgement from one glance at a photo/video of the first flight? Articles by Prodyut Das are full of such engineering judgements based on images (he admits it) and you know the general disdain in which his views are held on this forum. Whether those judgements are right or wrong, the difference between me passing such judgement and a learned person would be the credentials.
I did say earlier that the person who made that comment must either be a greatly experienced aircraft designer or a nobody. Let us hear his name if he is such a great designer who is able to take one look at one image or video and predict an undercarriage heating problem. That forum must be truly blessed to have such a person. We will respect him more for it and I will make a public apology for my comments. Such a learned person should have, at his fingertips, answers for questions that we have sought - such as expected temperatures at different distances from the exhaust pipe and what would be his recommended orientation of the HTT 40 pipes. A loose comment about a fault and no further information with only a statement that "Design faults are possible" is, to my mind something that any random person might do for timepass. I have myself made such comments about Chinese designs like J-20.
The point about blind criticism of the SDRE is a different issue - but not irrelevant. I will, in due course point out the attitude shown by making design judgements of non Indian aircraft after looking at one image. I have done that in the past and have been both upset and amused at the way in which people wake up and fight to prove that the American/European design team must be right and that my comment is misplaced. No one supports the negative comment with the excuse that "design faults are possible". Here we are fighting to prove that a negative comment about the HTT40 may be right. Funny innit? Just sayin..