Instead of merely speculating about the issues you described above, I will list my reasons for not buying the OP2. Hopefully, you will find it useful.
I had an invite to buy the OnePlus Two (currently using the OPO), I was very tempted to 'upgrade' until I listed down what the price of 425 euros (shipping incl.) would get me. It wasn't really worth it and barely an upgrade.
I lost:
- My slick bamboo cover
- NFC chip
- Battery life?
- Thermal performance?
- A working home button
- Micro USB
- A crappy processor that has caused many problems in other devices, which was probably their most cheapest choice as I can't imagine other companies jumping to buy it from the manufacturer.
for:
+ Fingerprint reader that barely works, and isn't a real button.
+ Somewhat cooler design.
Then I compared it to what other devices I could get for that money. A Samsung Galaxy S6 goes for about 490 euros, which has AMOLED display (nice because I like making my screen dark, this would save battery life), better camera, better processor, fitness stuff (heartbeat monitor etc), better battery life, NFC, option for Wireless charging, no messing around with USB-C.
To conclude, I don't think the OP2 is a "flagship" killer as it claims. The competition is fierce, and the things OnePlus had to do to cut the price down marginally isn't worth the few bucks. They are currently rushing the invites because they can't keep their promises of being able to deliver the OP2 to as many people as they had planned. With more devices coming up soon such as the rumored Nexus X5 by the end of this month, OnePlus is in a tough spot.