Ok let's answer that one by one shall we.
Before we start I hope you do realise you are comparing a phone that costs 66k (iPhone 7 plus 32gb) to a phone that costs 11k. If that is not answer enough let's start point wise.
Points 1,2 and 3 about the build quality. Xiaomi makes pretty solid phones and you are one of the very rare people who have complains on that end. But still giving you the benefit of doubt. You are comparing the build quality of a phone at 11k to one at 66k. At that price you can buy 3 Redmi note's and still have money saved to have a Bangkok trip with friends to that that awesome massage. Even if you are not a fan of Thai massage you could have bought a HTC, Sony, oneplus, Samsung flagship if you wanted top class built quality.
Point 4, battery life of the Redmi Note 4 is absolutely amazing. The iPhone doesn't hold a candle against it in that regard. You will realise it when your workmate asks for iphone walla charger in 6 hours when your phone hasn't been charged in 3 days. Enough said.
Point 5, the dac of the Redmi doesn't suck but yeah the iPhone is better. But like I said when you are paying 6 times the cost your phone better spit out John Lennon himself when you play his songs.
Point 6, hahah this is my favorite point. Forget bootloader do you realise apple doesn't let you install apps outside of the app store forget allowing you to unlock your bootloader on an iPhone. Infact it goes above and beyond the call of duty to make sure you can't jailbreak your phone. One of the primary reasons why the jailbreaking scene has gone down so much. While it's bad that they require a unlock code, once you get that you can even run potato os on your phone if you want to. It's your phone you can run what you want. Try running toaster os on your iPhone
Point 7, well if you expect dslr quality photos you buy a dslr but even if you don't like the photos it clicks again you do realise you are paying 1/6th the cost. You want mind blowing photography from your phone buy a Samsung galaxy s8
The non phone related points.
One word Spotify
(it's free
)
And before you say what I know you will say, another word VPN.
First of all, i never compared a iphone 7 to a redmi note 4.
points 1, 2, & 3,
Price point is not a justification for poor quality control, not when you are a multi billion dollar company selling products at a fixed price point and advertising features at that price point.
lets say ford is selling ecosport (redmi note 4) and mustang (mi note 2,mi mix), If the engine in Some ecosport models gives up after touch 100 kmph on a concrete road, Ford will be obliged to do something about it, the car can drive at 100, i drove it at 100, not that it broke, they wont tell you "its not a mustang dude, you get what you pay for!"
There are ecosport owners who dont have that issue,they are happy with it, its selling well (in this case, happy redmi note 4 owners), there are Ford models and vehicles that dont have this issue (redmi 3s, and my personal Mi air purifier, mi mechanical keyboard)
I used the phone normally, how i used my nexus 5, 5x, moto G and a lot of other budget phones, i held the phones before on same regards as iphones, but this time, I cannot due to the build quality issues above.
point 4, "battery is fine, no complains there" as i said above.
point 5, once again, i was not expecting this, i was not expecting a downgrade, thats my statement, that is why i wrote it.
point 6, That doesn't change the fact i did not have to apply for some BS permission and wait a month to unlock the boot loader of my nexus devices, Why do i have to do it now? i will do it because its an android phone, and this was the first thing i did with an android phone.
apple is gradually opening up Ios, If i can jailbreak, i will, but if i cant its fine, VLC, night shift a lot of things people jail-broke for are appearing on the app store.
point 7, the camera disappointed me compared to the phones before, i was not expecting DSLR quality, i clearly said that, but it still did, that is my point there.
spotify free on mobile has a lot of restrictions, poor quality, is 6700 per year to beat apple music, apple music is 1600.