Rather, not every soldier has the same chance to end up under a barrage. Artillery is pretty darn effective, when it shoots the right location. In Ukraine it continues to create 80%+ of casualties, as since 1914 at least or so. You just don't want to end be at the receiving end.
Again, it depends on what kind of training your conscripts get (At one extreme, conscripted legionaries served 20 years), and what the alternative is. The US got the luxury of having two oceans between it an any threat, so it can take its time creating a proffessional army if needed. If Finland is attacked, it would at most have a few weeks to react.
US also has the luxury of being stronger than any of its potential opponents in several ways and has a network of allies. Its own allies have the luxury of having US backing them up(Japan, South Korea, Taiwan etc) or be one of the members of a strong alliance(NATO members).
1200 km of common border with the only possible threat, that is much stronger, and almost similar length of coastline don't make things easy. Wartime strength of 250,000 + 100,000 in immediate reserves(almost 7% of entire population) is IMHO, among the others, necessary. During the cold war it peaked at 500,000 at one point, over 12% of the population then. That 250,000 doesn't include a single foot unit. A fully professional army with at best a single tank brigade just wouldn't cut it.
At the moment the time it would take to mobilize the key units mainly manned by conscripts is less than a week. Air force, air defenses and the navy would likely be ready within 24 hours. Conscription allows to have all the fancy toys in similar numbers to everyone else, supporting (relatively speaking, again) a very large army, because most of the manpower is in reserve and equipment in storage.
And, incidentally, more artillery and than clean socks. (to be 84 more Leopards by the end of the year)One downside is that 90-something % of male population spends approximately a year less in working life.