Currently, logging interval for sensor internal memory is hard-coded to 5 minutes (10 days of results). It would be useful for user to be able to select longer logging interval, for example 15, 30, 60 minutes. This would allow more measurement results to be stored to sensor internal memory, reducing the frequency of visits to off-site sensor (summer cottage, van etc.).
I understand Ruuvi team may not want to implement this feature, since it reduces the need for users to buy the Ruuvi Gateway. 
So, this is partly a financial decision.
Just my $0.02.