Advice: How to use custom objects

Content

Hi,

So I had a conversation with the original team behind setting up our instance and they've said we've implemented custom objects incorrectly. I would very much welcome your thoughts

Situation

For the sake of simplicity - let's imagine we have no custom fields left to use. So we need to build a form for, let's say, ordering a pizza, one for buying a car, one for applying for annual leave and one for booking a holiday. 

Current Setup

I would create a custom object for each, setup relationships to an incident etc. This to me is intuitive coming from a database-design background. We can concentrate on each object individually and tailor our solution accordingly. Reporting will be quicker due to object size etc