Does it make sense to divide business planning into current and investment planning as separate entities

What is the point in dividing business planning into two separate entities within the framework of the same company and the same forecast - business planning of current activities and business investment planning?

A business plan is one general vision of the development of an organization's economy, taking into account all types and directions of its activities, which may differ only in the calculation horizon (short-term or long-term period). This is one document of the company's development, which should take into account all its financial and economic processes, both current and investment.

The entire forecast should be built within one financial and economic model, and not separately.

It is pointless to single out two business plans as separate entities of the same planning process in the same company.