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User expresses annoyance with the current 'energy system' on Duolingo mobile and prefers the older 'hearts' system, which is still available on the web browser. They find the web experience 'much nicer' due to this and the ability to use an ad blocker.
The whole energy system annoyed me so much that I switched to using duo lingo on web browser as that still has hearts, with the added benefit of ad blocker. It's so much nicer now.