Layer 3 to access with OSPF - area design question

I am designing my first office with layer 3 up-links to the access switches. There will be 2 core switches and 30+ access switches across multiple IDF's with a single /31 up-link to each core.

I have a question on whether each access switch needs to be in a unique area (1,2,3...), or can I put all access switches in area 1, with up-links back to the two core switches (area 0 / ABR's)? I'm thinking of of just using area 1 for all access switches to make the configurations easier.

Any design or performance issues you could see from this? Would you put each access switch in a unique area?

I'm following this packet pushers example for reference and plan on adding BFD, using /31's with OSPF set to point-to-point for the crosslinks, totally stubby.

packet pushers example

I appreciate any advice or real world experience you have!