Group: inconsistency in more-info

[ildar170975]

Consider these groups:

group:

  testing_group_1:
    entities:
      - sun.sun
      - sensor.processor_load

  testing_group_2:
    entities:
      - sensor.memory_use
      - sensor.processor_load

  testing_group_3:
    entities:
      - binary_sensor.service_on_value
      - binary_sensor.service_off_value

  testing_group_4:
    entities:
      - sensor.battery_iphone_5s
      - sensor.battery_iphone_5s_32

Compare more-info for these groups:

Here 2 entities of different domains are present.
Data are displayed for sun.sun only.

Here 2 entities are of the same sensor domain.
Data are displayed for 1 entity only.

Data are displayed for both entities.

Data are displayed for both entities.

What I find inconsistent:

1. Why data for only 1 entity displayed?
2. What is a purpose of displaying attributes?