A small tweak to the health system

Much to my dismay (and to many others), I've discovered that if I try a new lesson with the health system, there's a good chance I'll abandon the app completely. I was fine with the old heart system, and we know the factors:

1. New vocabulary I've never encountered before increases my chances of losing a health bar.

2. An idiom, irregular phrase, or new grammatical structure increases my chances of losing a health bar.

3. A human error (i.e. accidentally pressing "continue" before finishing the exercise) would cause me to lose a health bar.

The above would understandably lead to frustration. I think it's great that Duolingo are forcing users to slow down for better language learning, but what kills it completely is that I cannot refill the health bars without:

1. Taking old, basic lessons that have little or nothing to do with the new lessons.

2. Paying money, which defeats the entire purpose of learning.

3. Wait hours just to fill one bar, discouraging its use.

4. Watch an ad, which wastes my time and I don't like being forced to watch ads.

I'm fine with ads being integrated as part of the flow as I know monetization is important for a free app, however these recent changes are seriously hindering my ability and desire to continue further while giving competitors an opportunity to capitalize on this drawback.

The small tweak they can do is to simply refill the health bars after every failed lesson. There are other and better means of monetizing without tying it into language learning.

Also, their lingots to gems conversion ratio makes no sense.