In the UK where I am, most standard (not budget) property policies would cover theft from an unlocked entry point.
Two main exceptions:
1 - if you are letting the property to someone else, e.g a lodger or have paying guests staying with you then this is typically excluded.
2 - if you have had previous theft claims, live in a high crime area, or you have a particularly high risk (e.g lots of valuables), the Insurer will add an endorsement that you need a minimum standard of locks and have them engaged when the property is unoccupied.
Outside of those, if you accidentally leave a door unlocked, your claim will likely be paid. The situation obviously may be different in other countries. I worked for a property insurer and saw hundreds of these claims (entry via an unlocked entry point) paid during my time there - I also saw many declined because of the above.
I suspect that over time the number of policies in the 'budget' category will continue to increase as price continues to trump everything else for most people]
edit: it is the same for the other lines I mentioned as well -e.g a cyber policy I saw recently has no conditions relating to use of MFA. It will have been factored in when writing the risk (they will have said they use it) and if it turned out it was a lie then there would be an issue with cover but if it was just a case of an admin forgetting to include an OU in the MFA group policy the claim would almost certainly be covered. Policies aimed at the SME space are much more likely to have specific conditions though.
