First, every project has three levers: budget, timeliness, features. Choose two. So it's not about not trusting the development team. It's about understanding the tradeoffs and how the delivery date will be affected.
Second, how well can you predict what you can achieve as a developer in one day vs one hundred days? The estimate for the former is more reliable. Likewise the estimate of what you can achieve is more reliable in a one week sprint than a two week sprint. Being able to break fully deployable commits into smaller chunks (up to three days coding time) is a skill that gets better with practice. But sometimes you just don't know how long something will take because it needs breaking down and investigating. One week sprints are ideal for timeboxing investigations; here the output isn't software but discrete software tasks that fit in a one week sprint.
Ultimately it's not about trust, it's about accountability and predictability. Sprint planning tools when used appropriately don't constrain engineers, but rather highlight the truth of how things are going.