Great news everyone!
Just as I guessed, my prediction was correct. Take a look at those photos below.
I took photos with iPhone 7 plus(iOS11) and iPhone SE(iOS10),
then I imported the photos into Photoshop and zoomed x25.
As the info shows iPhone 7 Plus has more details than iPhone SE.
(4.4MB vs 3.7MB, compression rates could be different)
What I can tell you guys is that Apple doesn't want to bother fixing a soon becoming old iOS10 jpeg bug issue, but in the upcoming iOS11 will fix the jpeg compression issue!
In my opinion, we should keep iPhone 7 Plus!! It's still the best camera(with iOS11)!!
iPhone 7 plus (ISO20, 3.99mm, f1.8, SS1/3195, x25 crop, Originally HEIF > JPEG 4.4MB)
iPhone SE (ISO25, 4.15mm, f2.2, SS1/2564, x25 crop, Originally JPEG 3.7MB )