Sun Sand, 21 Dec 2018USB C & Notification Light are the 2 things they can incorporate in phones. Notification Light would no longer be usable especially with this era of bezel less designs.
And it's either USB C alone vs microUSB and 3.5mm jack. At this price point, you can't have the best of both worlds.
2019 is a few days away and vivo and most probably xiaomi are still releasing phones with micro USB
I've seen so many Vivo phones this year that could literally last me a lifetime.