Couple notes about devving - if you're playing tall, since there's a few nations built for this (Netherlands, Tuscany, etc) then yeah you really don't blob and can spend it on development instead. Otherwise if you're playing wide, what Furry mentioned is how I also play - as a dump for maxed out mana. However there are a few exceptions:
1) Getting to dev 30 in your capital (or another province with good modifiers like it being on a grassland) for the objective in the first age, age of discovery. Double bonus, if you wait until after Colonialism spawns, you can dev after and spawn it in your land, killing 2 birds w/ 1 stone
2) If you have a gold province, get it to 10 production dev to maximize the money it makes
3) When you need to spawn a new institution in your land. This is especially important the further away from Europe you are (like playing in Japan, good luck getting most institutions quickly w/o developing)
4) Needing to upgrade a Center of Trade - Level 2 harbor needs 10 dev, level 3 needs 25 dev
5) Needing to unlock a new building slot; since they unlock at 10 dev, 20 dev, etc
1) Getting to dev 30 in your capital (or another province with good modifiers like it being on a grassland) for the objective in the first age, age of discovery. Double bonus, if you wait until after Colonialism spawns, you can dev after and spawn it in your land, killing 2 birds w/ 1 stone
2) If you have a gold province, get it to 10 production dev to maximize the money it makes
3) When you need to spawn a new institution in your land. This is especially important the further away from Europe you are (like playing in Japan, good luck getting most institutions quickly w/o developing)
4) Needing to upgrade a Center of Trade - Level 2 harbor needs 10 dev, level 3 needs 25 dev
5) Needing to unlock a new building slot; since they unlock at 10 dev, 20 dev, etc
- 2