Yes, 3 points of contact, but as taught on the last working at height I did your knees can be points of contact.
They shouldn't be used for long periods of working, but for short duration tasks such as changing lamps and fault finding I see no reason not to work from a ladder of it's the only access equipment which sensibly fits the task.
The suggestions in this thread about having scaffold built or using powered access inside a church seem ridiculous to my mind.
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That's not much different to the basket on a tallescope.