Yes. This is the car I went for. It is still safe to wait for one year. The materials do not get substituted that early. FL models only address the problems found in original models. Sometimes material substitution start at FL model. I am more keen on the Preve FL than the SS actually. If they carry things learn from Preve > SS > Preve FL > SS FL, then generally Preve FL better. The Preve LE is not a Preve FL and does not have the same tech as SS. The current Preve should have same materials as launch Preve.
Unfortunately I cannot answer on EB as I don't follow the car. My family is not that big yet for me to start worrying about EB

. I know the Bold carries the CFE engine which is good. The E got a 6 seater (Prime). EB got 3 models with CFE engine. IINM the EB is the 7 seater model. Get the EB with the leather finish and you should be fine. It is generally better to buy new MPV's if possible for small children family because they tend to be lasak and interior gets a beating. If children already big >12 years, then the interior tends to be better. Also, usally MPV's are only bought for a very specific time frame, like 10 years. or so. When children grow up/leave the house, people tend to sell off their MPV's.
Also, IINM the Exora has another 3 years of shelf life before replacement model. FL only introduced last year. Look at 2017 onwards at replacement model. Original exora does not have CFE and only base model. A lot of people complained about that, so they upgraded CFE, then people stop complaining. If people don't complain about material used, then subtle material replacement will occur. One reason Proton does this is because they can actually. People only review the car at launch, not the car 5 years down with substitute parts. Also, that time, no internet proliferation. So if change also, people don't know. I don't think Proton can do that without people noticing it and posting it everywhere from FB to forums. Or if people notice it, they are not getting that annoyed and just accept that "takdir".
HTH. I think you best ask Exora forums about the car.
Would want your honest opinion here. Do you think SS is good for four people instead of going for EB ?