It really isnt when BB introduces buildings like one of the new ones producing resources needed for lvl 7 upgrades that are deliberately unupgradable, and production is deliberately so low you really want at least 4-5 of those., which you need space for.
Considering the fact that production increases are linear (which means later upgrades diminish in value), if it takes a year to upgrade 4-5 buildings I wouldnt call it nice, I would call it defeating the entire purpose of upgrades.I am quite happy that we now have level 7 on some buildings - assuming then game is still with us in a year I shall probably have upgraded 4-5 buildings by then - nice and slow.