To the PP who said the difference between allowing a 6 year old to slowly gain independence, it’s too late by then, they’re already used to the ‘capable’ adults doing everything for them and have already learnt that they’re not capable and can’t do it, because that’s what you’ve been telling them for the past 6 years.
oh come on, by making silly statement you are losing all credibility.
I honestly think over-reaction and excess EITHER WAY are ridiculous.
First of all, everybody is talking based on their own home, and might think differently if faced what other set up exist. I mean, it can be as simple as having an alarm downstairs, which the kids cannot reach at all, so they simply can't go until you get up yourself and switch it off.
Some people are working from home and wouldn't want a toddler to access and rummage through their work stuff.
Leaving a baby alone because you can't be arsed to get out of bed sounds awfully selfish and doesn't give a nice message.
Leaving your kids to be whilst you get on with things they are too young to help with, is normal.
I never had stair gates, playpens or stopped my kids from leaving their bedroom, but come on, there are still a lot of things a 6 year old is still too young to do independently 
When some posters have to react in such an over-the-top manner, feels like a nerve has been touched.