Howdy, howdy!
I love talking about "app ideas". Or just ideas. It's like a fun game for me. I even enjoy it when non-technical folks tell me about an idea they have for some app or website that they wish existed.
I enjoy asking questions and digging into it.
And those situations very often lead to one of two directions:
Someone was recently saying they were aware of airplane tracking apps (like the one this guy built for his toddler who loves airplanes)... but that they wanted one for tracking trains.
Like, I'm stopped at a train. My child wants to know: What's that train? Where did it come from? Where is it going?
The app itself isn't incredibly complicated to build.
But where do we get that information? Is there an existing service somewhere, or entity, from which we can get that data? Is it live? Is it stale?
Is there some very good reason it doesn't exist or isn't publicly available?
Who has it, and how would we get it are the hard parts.
"I want to create a new Twitter" - a site where anyone with an account can post short text messages.
Great! The X/Twitter functionality itself is actually pretty trivial. (Hand waving the scaling complexity of having millions of users for the moment. Please suspend your disbelief).
But twitter works now, because so many folks are there.
Twitter grew slowly, and was something else entirely in it's early years.
Because it's not the idea. ;)