Why does the Fenix 6 does not provide the daily training proposals, optimized recovery time and optimized intervalls known from the forerunner 945?

Hi all,

I'm curious, I'm just about to update from the Fenix 5 to either the Fenix 6s pro solar or the forerunner 945 LTE. 

I always thought those two high-end watches share the same software and functionality, thus I kind of was surprised looking at the specs that there are quite some differences. 

Is this just a gap in the technical documentation or does the Fenix really lack the custom training proposal, ...? Also the other way round, why can the forerunner not be put into a low energy mode like the Fenix?

If not supported I would appreciate if Garmin would put on the feature toggles, take this as a feature request or explain why this is not possible?

Thanks a lot in advance for your expertise and help!