Question to the Home Office:
To ask the Secretary of State for the Home Department, for what reason evidence from visa sponsors is not requested at the start of the application process.
The step by step process for applying for a Standard Visitor Visa is set out on Gov.UK here https://www.gov.uk/apply-standard-visitor-visa
Step 2 “Prepare the evidence you need” provides guidance and links to guidance on the supporting documents that can be provided.