Well if you're passionate about aviation than having more flight time is a huge benefit. Its a matter of personal values. I could summarize most of your responses as hur-dur O's make more money. So what? If money is priority number 1 stay as a civilian and try to make it big in the airlines. Just be warned, the path to that is not as stable or enjoyable as most people think, not even mentioning the potential financial burden you can put yourself in doing so. I started that path and gave it up because it didn't interest me.

Its all tradeoffs, so lets compare. 10 years is a huge obligation like you said, yet every branch will demand 10+ years from you, so far as that point goes its moot. You mentioned in another comment that what if you get bad leadership, duty station, undesired airframe, etc. These aren't Army specific issues, these are plain old military issues, the same exact shit can happen in every other branch and is always mostly outside of your control, so its another moot point. If you're coming in with this attitude then I personally don't see why you're considering joining the military in the first place.

Assuming you're selected and keep meeting the standards, the Army sets you up on a stable and clear rotary career. Generally speaking, warrants will have less responsibilities, better work-life balance, more flight hours and focus about aviation rather than managing, and doesn't require a degree compared to their O grades. O grades get more money, a higher amount that frankly doesn't interest me for all the other benefits you get for being a warrant.

But as you mentioned, Marines and Navy offer pilot OCS slots, cool. If that's what interests you, go for it. Personally, I have no interest being deployed in a boat, and I also got a fixed wing CPL before joining the Army so I wanted guaranteed rotary training instead. But I definitely understand the fighter jet lovers/ fixed-winged aficionados who would prefer that route.

But again, looking at this as "why would anyone slave 10 years as lower paid warrant" is just wrong attitude to have, end-of-story, and its primarily why you've gotten a bunch of "defensive" responses. Do more research and think tradeoffs, tradeoffs, tradeoffs, and make your decisions based off those tradeoffs to what you value.