What an unconditional yes actually costs
A provider that accepts every request will eventually perform work it is not qualified for, and the consequences land on the site. Liability may sit with the facility rather than the contractor, insurance may not respond, and a compliance obligation the site believed was satisfied may turn out never to have been. None of that is visible in the tender that awarded the work on the basis of flexibility.
The pattern is also predictable in the other direction. A contractor that agrees to too much cannot deliver it all, so tasks quietly disappear from the routine visit to make room. That is worse than a refusal, because nobody knows which items were dropped. A clear decline at the outset preserves the service the site actually contracted for. A written exclusion list is therefore a better indicator of a competent provider than a promise of flexibility.
