2 points to make:

1) Unsyncable content is old, currently irrelevant content. Unless you go fully synced with both Level and iLvl, you're still not doing the content at the difficulty set when it was released.
2) If you want to get your first kill synced, you can still go ahead and do that and feel good that while other people may need the unsynched crutch... You were able to do it the hard way.

I just don't get how everything in every game these days needs to be a contest... I play for myself and my enjoyment, not yours. If I find people who want to do something unsynced then that decision only affects me and them and has no bearing at all on you and your experience. Spend less time worrying about what other people are doing and focus on yourself and you won't have to hate anyone for these things.