I was also wondering about the stellar wind stripping away the atmosphere. Planets close enough to their stars to be tidally locked will experience more stellar

I was also wondering about the stellar wind stripping away the atmosphere. Planets close enough to their stars to be tidally locked will experience more stellar wind than those farther away and dwarf stars have more flare events than stars like our sun does, exacerbating the problem (plus flares can release a lot of high energy photons, which can break apart structures like DNA).