Ok, I read the review. They gave a decent 4 Stars for the device, unlike the complete rejection or deal-breaker like you said and they didn't make fun of it either. According to the review, one will get used to the display over time. Some of their review points on the display below.
So, did we notice pixelization? Yes, especially on solid colored backgrounds. What about jagged text? All the time? Are those deal-breakers? It depends!
Indeed, the low-res AMOLED suffers because of the PenTile matrix, but it's quite easy to get used to not see the tiny spikes on the letters and the dotted backgrounds. We are not saying you have to do it at all costs, but you really can. And then you can reap the benefits of the lower 720p resolution such as flagship-grade gaming performance across all modern games. How about that?
We are not sure why Xiaomi opted for a 720p display, but by doing so it made the Mi A3 a gaming phone on the budget. And we can very well live with that.
From the above points, it's clear that the display is not the best and it's not worst too. At the same time there are advantages too in terms of gaming because of lower resolution.
Hands-on for a few hours or a day is completely different from using it as a daily driver. If you are using high-resolution devices and all of a sudden had to use this device for some time, you would certainly feel it's very bad. However, if you continue using the device for longer periods, eyes will eventually get used to it and you will no longer feel anything, especially if you don't look at other high-resolution devices.
I spoke about the current scenario, not talking about the future. Of course, there will be new devices every week.
And bro, Galaxy S3 was launched for 43k that too in 2012. If Samsung didn't provide FHD at that price tag, we can be critical about it. But at 13k price tag, this is definitely not something to be that critical IMO. iPhone XR with 4 times higher price tag doesn't carry FHD display and it also has a similar screen size.
The point here is,
@KuLpreet Singh bro already bought the device, and there is no reason to make fun of that decision or discourage him. Hope you understand.