As someone who has fixed countless iMacs over the past 6 years from 2007 models to 2020 models I can confidently say that adhesive is here to stay and that is a good thing. The repair time on 2007-2011 models is significantly higher and more annoying. The adhesive is honestly convenient and nice, with 3-4 cuts you have the entire display off. An SSD upgrade can be done in 25 minutes on a 2015 iMac, on a 2011 the same repair would take 45 minutes.

Only if you replace the entire display.