If you have to add 30.000 soldiers a month to keep the war going, and you succeed in doing that, then you can continue.

But if suddenly you need 50.000 (the Ukrainian goal) and you start to struggle to find "even" 30.000 a month, then your war is basically lost.

Not instantly, but it's like driving to another city and there is no gas station on the road, and you can do it at 90km/h because the car consumes just that much. If you start going 130km/h and your car now consumes more, it's not an instant catastrophy, but everyone in the car now knows you won't make it, and might take action too.

Because they have been generally very high lately, and this is at least the fifth time within a month that the number for lost personnel is close to or above 2000. The average for the war is "only" just above 900. Casualties have been steadily more than 50% higher than average for the war for a long time now. Also they are insane because Russia is trying the same approach with less and less success. Trying the same and failing over and over again expecting a different result is a symptom of insanity.
Finally no these numbers are not to small to be noticed, many people notice, even pro Russian bloggers are beginning to notice this way more than before.

It's not just the numbers for today that are insane, it's also the numbers lately, and even compared to those, the numbers today are high. It's an enormous loss of life for Russia for no gains. Which is also insane.