[Galaxy Note 4 Android Development (Snapdragon)] logosA:
Let me try to explain here what is going on with root methods and what choices we have.

maybe less than a year ago, the dominating method was SuperSU by chainfire and most of people where using it and we all were happy.

After a while CM now known as Lineage , started to use their own SU, which they had inbuilt in their roms.

So all big rom groups , like RR , AICP , of course CM, where using CM SU, as you had to do nothing as roms where pre-rooted and most of users where happy with that as nothing to be done. No apps from play, no updates. You had your root, all apps requiring it had root access. That was a win-win situation :)

After that magisk come to town. Free, open source, with a lot of goodies, carrying gifts.

Even a lot people said its the new xposed. After that, hoped that by using magisk could pass safety net and use their bank apps, android pay and play pokemon and all other APPS and things requiring from us to hide root in order to use them.

Major groups decided to move to magisk as a root method. Most of users where pleased, group were pleased that their users were and that how domination of magisk we see .

Then problems with magisk started, loosing root, cannt pass safety net after it updated, apps started to function funny.

The thing is this.

Magisk is not playing well with Samsung

and maybe SONY devices as well.

A lot of users realized that and started to go back to SuperSU.

Then SuperSU had a crash too. Moving from version 2.79 to 2.80 was a mess. Most of devices , but mostly Samsung and SONY , seems to be affected from that . In version 2.82 looks like that chainfire has made some compromises in order to restore the problem and that effected access to external sdcard , which you, I and a lot other users experienced.

Some time later, groups like AICP decided to remove root with magisk and let user to decide what to do. A little late in my opinion, but better late than never. Magisk was a team decision (like RR ) which worked for most NON- Samsung devices. But now problems are more and more so they decided to remove it as built in.

So what to be done from a user at this point?

Three Options

1. supersu

https://download.chainfire.eu/1114/SuperSU/SR1-SuperSU-v2.82-SR1-20170608224931.zip

2. magisk 13

https://xdaforums.com/apps/magisk/beta-magisk-v13-0-0980cb6-t3618589

3 Lineage (aka CM) SU

https://download.lineageos.org/extras

the first 2 also have an app in apps drawer which you use to control behavior and updates

LosSU go to developers option, enable root access to apps and ADB and thats all you need to do.

WHAT IS MY CHOICE?

If you are like me that only want to have root access to my phone so I control it and not the phone and apps me,

go for lineage SU. In the next update of the rom, if magisk is still built in, after rom get flashed, run magisk UN-installer, then run Lineage SU (addonsu-arm-signed) and after boot up, go to developers option and enable root access to APPS and ADB.

YOu can still , even now if you want , boot in recovery, run magisk uninstaller (find it in the link above) and after that flash Los SU AND REBOOT.

If though, you like mods and hide root and all things that magisk can bring, stick with it.