Yuneec did include a good balance charger, it just does not have a discharge or storage feature. Yuneec, DJI, and all the other companies out there with proprietary batteries are banking on you not knowing how to take care of your batteries, and buying more $10 batteries from them at $100-$200. That is how they stay in business, spooky prices for consumables and parts.
That 10 for 10 is subjective. They really should have given a math formula so you know what voltage to stop at based on battery specs - and then how do you know if you are voltage under load, how much load, or parked voltage? I only watched the first video, and had already seen the second.
I've got one that got warm, not hot, after 10 min of full throttle and has the slight puffy under the label as well (wind ended my day and I had 1.5 batteries to return to drain, and my Tenergy charger was making a career of draining them down).
All three of mine have been flown to first battery warning then switched out, and returned to storage voltage since I got them. Only on my 4th cycle now.