If your product can be built entirely by "t-shaped" people, it's not a complex product.
The thing about experts is that they're experts, an expert is INCREDIBLY good at one particular thing.
The idea of "t-shaped" came about as management didn't want to pay for "full-stack" people.
You know, people who are very knowledgeable in the entire software stack your product is built in (But are also experts on one particular thing)
Today it's a SCRUM sales pitch, that you can do more (development) with less (people) and thus save money.
What you're really doing is overloading the people you have, and usually expecting them to all perform at the expert level.
"Bob can do this in 2 days, why do you need 7?"
Almost no project has no "crunch time", and crunch time means you need to fly as fast as possible, you can only do that when everyone is assigned work within their area of expertise.
If you need experts, get experts, don't get fooled by the "Agile" sales people.
Remember, the agile manifesto is only a few lines of text, anyone selling you courses and books are doing just that, selling you stuff.
Sounds like a great project for you to learn a low level language, and some UX and GUI design at the same time.
Game development is done in several languages and frameworks, so it's not a big deal what language you go with as long as you learn to write good code and document it well.
Every tool, language, and framework has downsides and quirks, literally every single one.
Over your career you'll use dozens of languages and tools, if not more.
The dude had been prohibited from owning a gun after domestic abuse against his girlfriend.
He tried to buy one anyway and failed a background check.
He bought gun parts and a 3D printer.
Police heard him firing in the woods, when told to put the gun down he told them he was CIA.
Officers inspected McGinnis' backpack and discovered a hit list titled "9/11/2001 list of American Terrorists" that included the names of both Democratic and Republican federal lawmakers.
That's why he was jailed. Not just because he had "a 3d printed gun".
Find a problem, solve it, charge for the solution.
All you have to do is fill in the blanks :)
It's not really tongue-in-cheek either, there are LOADS of books about this, but in the end it's all about finding a problem, providing a solution, and charging for it somehow (Time, licenses, platforms, whatever)
The best way to get there is to talk to people, don't ask them to think of products, just ask them how they go about their jobs and find out what the pain points are.
Where are they spending time on things that could be automated, or made simpler, or just eliminated by changing methodologies.
SPA isn't automatically the best solution for a page or site with frequent updates.
The updates are handled by JavaScript and http calls.
You can write a lot of that stuff in a dozen lines of JQuery with nicely refreshing content and ajax instead of throwing in large amounts of framework bloat.
If you have zero of that content cached locally and are on a mobile or just not-fast connection it'll be way more than 1-2 seconds.
Your "solution" is one of the ones responsible for locking up mobile browsers all over the place, because the browser still has to deal with the entire DOM, and it's often done way inefficiently.
What's better about this one?