Energy from the star is the defining factor in relation to the habitable zone, as that zone is all about the possibility of liquid water existing.
One of the things talked about in one of the links i gave, was how those planets in the Trappist-1 system may have moved to their current orbits over the life of themselves and their star. Also the early stage of the Trappist system may well have destroyed any potential life on those worlds, or even any water. They just do not have enough data yet to gather clues for any signs of those.
The James Webb telescope will offer one of our best chances to see some chemical details of what is going on on those planets, and obviously earth based telescope time is being furiously worked out for more detailed scrutiny.
If we can survive our greed and self-destruction (via climate change etc), we are living in an age of incredible potential for future human society and space exploration, and eventual colonisation. We can only hope all that effort is for nothing.
As an optimist, i’m really looking forward to what the James Web telescope can show us, exo-planet atmosphere sampling included etc:
‘The Design, Development and Delivery of the James Webb Space Telescope’: (47mins)
‘James Webb Space Telescope (1hr 32mins)’: