Idea Validation

I would really appreciate some feedback on a potential product idea. I really want to engage with potential users before setting out to build the product. If you could answer the following questions below. I am also open to private conversations for more in depth feedback.

When building a new project how much time do you spend building boilerplate items like Authentication, Billing, User Permissions, Support Tickets, ETC?

What is the most time consuming or challenging boilerplate item for you to build?

If you used a service that provides boilerplate items how would you prefer to use the service in your projects? API or Graphical Interface?

If you used a service that provides boilerplate items would you want the option to use your own data source? (Connecting to your own sql server or mongodb server being in control of your own data)

Would you use a service that provided boilerplate items ready to use in your projects?
If so, how much would you be willing to pay for the service?