Ask IH: why no website can gather problems posted by people from other areas?

Not sure I fully understand your idea here but can't this just be boiled down to general communication problems? Either 'we, who can create solutions' reach 'them, who have the problems', or they come to us?

Or are you just saying there should be some kind of platform where people stated their needs, and people could answer them or create the solution for them? (cus this already exists in many forms... it is just hard to have a universal solution that reaches everyone)

Tech is new, and people working in more traditional industries simply aren't all that familiar with using software to solve problems. However, I think this will improve over time as (a) tech continues to spread, (b) older people retire and are replaced by younger workers more familiar with tech, and (c) indie hackers like ourselves get better at identifying opportunities and reaching out.

Will there ever be a platform? Maybe (I'd say doubtful), but there are some big challenges it would need to overcome:

1. Retention/stickiness would be low, because usage would be infrequent. Coming up with unique problems your industry needs solved is not something people will do every day. That's like a once-a-year type thing.
2. Satisfaction would be low, because there are such high turnaround times between requesting a problem be solved and having someone build a solution. There's no instant gratification.
3. Competition with contracting sites. There's no shortage of non-programmers with app ideas, and most of them want to keep the profits for themselves, so they prefer hiring contractors to build them an app over giving the idea away for free.
4. People tend to stick to niche sites. For a platform like this to work, it'd need ideas coming in from hundreds of industries, but how do you get doctors, lawyers, restaurateurs, teachers, policemen, etc all to the same site? Possible of course, but hard.

Because a lot people in those industries do not see how they can solve their problems using software

I thought I saw a product already that did something like this. It was called Nugget something and I saw it on ProductHunt. I can't remember exactly what it was called.

You're right that there's a lot of solution providers, and a lot of service industry folks that both have either demand or supply of software that can streamline business processes.

The problem (and maybe the reason for the lack of existence) with marketplaces for this is that like any other, you're faced with the typical marketplace chicken-and-egg problem. So either people have attempted to tackle this and failed (and we never got wind of it because it didn't explode on PH, HN, or TechCrunch), or nobody has tried it yet.