While the Business Model Canvas cannot take the place of a traditional business plan, it is helpful for people who are more visually oriented. If you like to sketch ideas on napkins or whiteboards, you will appreciate the BMC.
The BMC is helpful in considering your product/service/brand, evaluating your target markets and focusing on your total marketing effort.
The traditional business plan will include all of this in more detail - plus - information on the business, its history, its owners and the financial need/ask including a full set of financials and projections.
These apply to any business, and can be used to ensure you have a good understanding of all parts of the business.
This is just one of many tools that a business may use to present or consider a business proposal.