"We have an idea that's not materialized yet, give us money so we can live comfortably and reap all benefits it it works out and not lose anything if it doesn't." - sounds like a wishful thinking.
No, it is risky, and you want to actively eliminate as many of the risks as possible. Having a decent sized pile of cash is one way out of several of the risks. Supply chain shortages, founder medical expenses, mishaps and accidents, rising costs of living, personal emergencies happening to founders or employees requiring leave, there are a million things that will bite you if you don't have cash and runway.
"Supposed to be risky" isn't a good way to think about it, IMO. A lot of the time you'll hear people romanticize a couple of fresh graduates living on couches in a garage, living on ramen, and building a unicorn, but the reality is that most billion-dollar companies weren't actually built that way, and it isn't the best way to optimize your chances of success.
For example, if you graduate with an engineering degree, can code, and don't have any grave medical conditions or loans to repay, I'd wholeheartedly encourage trying to start a company if you want to. It's risky in that the company would have a 95% chance of failing, but in that case you still learn a lot and it's fairly easy to land a job if you keep up your technical skills.
If you're stably married, your partner earns a high income in a stable job, and is supportive, that's another case where I'd say go for it, take the calculated risk.
In a lot of other cases, such as if you're knee deep in student debt, or (live in the US + have a medical condition + not a lot of savings), I'd advise building up a modest amount of savings first.
It really depends.