It’s not a routine requirement - but if seeking financial approval for an activity it can be required by the authoriser as part of the costs.
Remember that use of CHBS for travel is a mandatory requirement, with personal booking against capped rates being permitted ‘in exceptional circumstances’
Self authorisation is an option only available at specified levels
If the CHBS service was scrapped and only the only route was self booking via any source then a governance process would be brought back.
Its a bit of a red herring to pretend soldiers will be told to get 3 quotes for a hotel though isnt it?
The governance would be like governance for other expenses, its the RAO job.