In my case, I have a hunch that I would be a slow healer and would most likely get serious and gnarly scars. I also don't want to have all of these questions about my scars. I want to be able to pass with no questions asked. Right now, it isn't a huge deal, but I agree with DCQ that as more FTM and genderqueer persons opt to have top surgeries, it may make being stealth more difficult.
There is a great deal of variance between body types. I think that tumblr and youtube lead a lot FTM guys thinking that we are all going to look like skinny prepubescent twink twigs or muscled beefcakes after top surgery. Truth is, not all guys look great without their shirts on. Some guys have moobs, others have back fat and some have so much fur that you can't tell what's underneath. So I think it is important to keep a realistic perspective on things. If you're a bigger guy, a perfectly flat chest may look odd on you. If you have bigger breasts, you probably aren't going to be able to avoid evasive top surgery procedures. Them's the facts, it seems.
Further research into top surgery and gynecomastia procedures has yielded some other fruit. Apparently, bioguys with gynecomastia also get DIs when the case is severe enough. It is pretty rare for this to happen though.