dreaming - a longer tenancy can mean a better sense of security.
Every time you move, your routine is broken up, and has to be re-established which can take months - simple stuff like doing the washing up, trying to get your kids to settle at night in a room which smells alien and may be painted lurid colours.
In a longer tenancy, its worth decorating how you want, things like putting in stairgates, making it work with your lifestyle, making it safe - all simple stuff but essential to get that 'home ownership' feel. Making friends with neighbours, finding safe babysitting etc
More security means happier families, who are more likely to stay together and more able to make contact for solutions when they can't pay the rent.
Stable familes also have fewer accidents in the home. (Be interesting to know if this statistic has gone up in recent years).
Difficult familes who've not known security and are not known within the community, are far more likely to give up in despair and feel 'owned' as people by their landlord, to suffer the stress of a master/servant relationship (even though they are paying rent initially) then trash the place and run off. As evictions add up, insecurity becomes the norm and a sense of 'ownership and pride' becomes impossible. Even with a house, they are homeless.
Landlords need to act as if they are the ones being hired by tenants, not the other way around. They are not charities, doing everyone a favour, they are not volunteers helping the homeless! They are gaining or hoping for wealth or they wouldn't bother.
Nothing wrong with that - but it comes with responsibilities in this particular investment option.