The advantage of registering domain names regularly is that a change in the google indexing or algorithm can be immediately detected. It appears that in february 2017 some newly registered domains, which were partly indexed in google like pictureset have got deindexed, when earlier they would get indexed almost immediately with 3 days.
In other cases domains like solarcore , pcworkathome and wahp which were deindexed due to hosting problems or using ad networks like Bidvertiser have also got deindexed and are also not getting indexed quickly . Only after spending a lot of time and money , it will be possible to find out why the domains are being deindexed, and prevent the waste of domain names.