If you choose a technology stack that is not right for your project, you may face the following issues:
Adopting a new stack will take more time, and building the product from the ground up will take even longer.
If the tech stack was chosen without the scalability aspect in mind, there might be issues with the product being able to scale horizontally and vertically.
It’s possible that you’ll have a hard time finding developers with experience.
There might be security issues resulting from the usage of unreliable technologies.