You have no idea how grants get funded. This is how I remember it as of approximately 2002. The head of the study section selects people (10-15) (usually friends) to review grants. The people in the study section each got a big box of grants (30-40) now probably distributed on DVD or online. They have a relatively short time (month) to review them and write a synopsis and opinion on the grant, while still doing their regular job. They usually farm out the reviewing and synopsis writing to their grad students, pos-docs, or employees. They send the synopses to the members and they have a week to read them. They all get together in one room. There are a certain # and $ amount they will fund. They quickly discuss the grants and winnow down the number and $ amounts. If there is a rival in the study section, forget about getting funded or have the $ amount drastically cut.
The grants are about what you plan to do, but most of it is what you have done during the last grant to justify giving you more.
It's also like the government , in fact it is government $. If you don't spend each year's allotment. it doesn't carry over to the next year. When I was in grad school in the 80s, the prof came in and said we had one month to spend 15K or lose it. We stocked up on non-perishable supplies like pipettes and petri plates and bought equipment we didn't use for a year or two.
It's like making sausage or law, you don't want to see the process.