The above link includes a screenshot which shows the reply I got from samsung when I inquired about the new Android Pie update for Galaxy A5 2017. Hope this would be very important and it worth to be published!
That's a mechanical response. They are not going to provide an update, unless some miracles happen. Look at the notice of list eligible devices for the update : https://imgur.com/gallery/g9LHMyd
Android 9 is using less ram and cpu power than Android 8.x, what is a fact, and there is also better battery life optimalisation than in Oreo, but it is true, that animations and graphic interface between different tasks in Android Pie is more difficult for the device than in Oreo. Personally I don't like Android 9 and One UI. I am not using A5 or A7 nowadays, but I have tested A5 and I have also been using galaxy s7 and I know, that all of mentioned devices can run Android 9 with no problems. However, if I was the owner of Galaxy A5 I wouldn't be angry about being kicked out of Android Pie update list. (written from my note 8 running Android 9, I'm sorry for my bad english)
Maybe they will yet early days! but J3 2017 i mean cmon, why does that get PIE??? A5/A3/A7 are mid range phones not cheap!!!!!! Batteries are still so good ! its easily got one more O/S Life left in it..............They should of come with Nougat so Oreo is really just 1 upgrade!!!!!! I feel they will do it just taking their time over newer models...........but they would easily run pie with specs!!!!!!!