The end result is the same though. If your application is rejected in the US, you could stay while you appeal, but if you're ultimately rejected then you have no choice but to re-apply through consular processing anyway once your status runs out. Good if you have a job in the US, but you're kicking the can down the road.

> A refused green card application might be the end of being ever in usa.

Do you have evidence for your other claim? The main thing you need to prove for a non immigrant visa or VWP is that you won't overstay or have intent to immigrate at the time of application and upon entry. Otherwise it's up to the consular officer like usual. You would need to declare the refusal/denial of course.

What will get you denied is "inadmissibility" if you don't submit a waiver. If you're inadmissible that usually means some serious violation and you've got other problems.

As far as I know, people have been successful in re-applying for EB green cards after being rejected when they've assembled a better packet.

If you apply for immigration status and are rejected, sure you can apply for immigration again if you gain much better qualifications. I haven’t seen many successful examples though.

People are deemed to have immigration intent for small things like they don’t have enough ties to their country of residence. An application for immigration is definite proof you had intent to immigrate. You can wait like ten years, but time doesn’t work in your favor (immigration gets harder every year, people get older and handcuffed elsewhere…).