On mobile it reverts you every few days whether you want it to or not and you have to set it again.

There are a few extensions around for each browser that fix this, but every time it happens it makes me angry at whatever person thought this was a good idea.

If they rely on metrics for old vs. new this 'feature' obviously distorts the reality.

Strange, mine doesn't revert that frequently. I think over a month since the last time.

I think they do experiments, I used to get reverted daily, and so changed all my bookmarks to old.*. And at some point, they removed that behavior, and now remembers my prefs. The day they stop supporting old, I'm out of reddit.

I use the boost client on mobile. It's quite nice.