Reducing the rate at which the infection spreads increases the availability of medical resources to treat those that need it. Flattening the curve reduces the CFR and more people survive.

If 100 people are going to get a disease, and there are only 10 beds available, if all 100 get it at the same time, 90 of them will not get a bed. If 20 of them get it a month for 5 months, half of them will get a bed.

As to the ACE2 issue, the study - the only study I have seen which is supportive of this theory - was not peer reviewed, had exactly 8 subjects to base conclusions on, one of which was an Asian male, and none of which were Caucasian males. What is the basis for concluding from this study that Asians are more susceptible to SARS2 than Caucasians? It's nothing but speculation.

While we can't trust official numbers, since no one but Singapore and South Korea have carefully tracked infections and outcomes, which doesn't affect this issue, today Europe has surpassed all of Asia, including both China and Iran, in officially reported deaths from SARS2. Information from both Iran and Italy indicate they have rates of infection and CFR there, where populations are primarily Caucasian, that are higher than those reported in any ethnically Asian country.

Available evidence, as sketchy as it is, and utterly incapable of being trusted, reveals that the ethnic targeting theory regarding ACE2 expression is backwards. From the data we now see regarding infections and deaths on the ground, Caucasians are more susceptible to infection and fatality from SARS2 than Asians.

In fact, we just have no evidence for any such ethnic targeting or difference for SARS2, because there's no good evidence at all.

A couple weeks ago I read an article on Breitbart that claimed a researcher in Beijing had been convicted and jailed for selling more than $1m worth of used lab animals in a wet market. There was no link to source in the article, and I searched for that source. I found dozens of articles that repeated the claim, simply copy and paste from Breitbart, but no source.

Sometimes people make shit up on the internet for reasons. This ACE2 ethnic targeting theory appears to be exactly that, although the study posted on BiorXiv at least exists, despite not providing evidence supporting the actual ethnic difference in ACE2 expression due to it's lack of participants. You just can't extrapolate from one individual an ethnic difference common to billions of people from an ethnic group that wasn't even represented in the study at all.

I have posted a link to the original study on BiorXiv in the OP, and you can read it for yourself, which I recommend you do if you want to actually understand the basis for the claimed ethnic targeting. There is no nominal evidence whatsoever for that claim, and current infection and fatality rates in predominantly Caucasian nations indicate the opposite targeting has more evidence.

While the absence of evidence is not evidence of absence, it's absence of evidence, and can't support extraordinary conclusions, which require extraordinary evidence.