Can use iPad 12W charger to charge iPhone 6s Plus without any risks?

Dear Colleagues,

I know that were many debates years ago (2013) about this hot topic:

Re: Can use ipad charger to charge iphone?

Even then, and before the topic was closed, was more or less agreed that:

• Use of the iPad 12W power adapter to charge the iPhone 5 is approved by Apple.
• Use of the iPad 12W power adapter does no harm.
• Use of the iPad 12W power adapter provides no benefits–other than convenience.
• The iPhone 5 battery will not charge any faster using the iPad 12W power adapter.
• The iPhone 5 internal battery charger circuit will limit its current draw to 1A maximum, even with an iPad adapter than can supply 2A or 2.1A.
• By this reason, the iPhone 5 battery will not suffer any damage because for it will not be any difference of using the Apple's 5W or 12W USB power adapters.

but I don't know if since then, the iPhone 6s Plus can benefit of the higher output current of the iPad 12W charger.

Anyone knows (or measured):

1. How much current can draw the iPhone 6s Plus?
2. In case it could draw more than 1A, how much faster could charge it using Apple's 12W adapter?
3. Would it iPhone 6s Plus battery get hotter due the higher current draw? Any experiment done on it?

I really wonder, if with the introductions of the iPhone's Plus models, if Apple introduced on them the capabilities to charge quicker using the iPad's 12W adapter; and if any user experienced any lost of battery lifespan doing it.

Thanks by your sharings in this interesting topic!