I think it becomes necessary to add additional ventilation openings on the side panels because most people are not following recommendation to use blower display card even though the standard/default airflow design of M1 was based on blower card, AFAIK. Even more important is, both Nvidia and AMD are releasing their reference design in favour of axial fan cooling. Just look at the RTX cards. All FE cards do not use blower fan design anymore. I suspect the trend is to ditch centrifugal fan cooling and axial fan cooling will become the new reference design. At the moment, I think axial fan cards outnumber blower card by, at least, 10 to 1. So, it is wise for the ventilation of M1 be updated in such a way to cater primarily for axial fan cooling cards.