RFI: In criticism of defense in depth

[selil]

Strategic:
The most promising approach is likely to attack elsewhere; defence in depth usually requires many resources for sufficient strength (else is becomes too porous).

Tactical:
Entice the enemy to switch into a mode that suits you better, such as pursuit.
Alternatively, search for a spot that doesn't allow defence in depth. This usually includes something that should better not be given up (such as a dominating height).

I like that very much thank you. Defense in Breadth is often given as another option with similar resourcing and control issues. Speed being a huge factor for it to work (if it ever did). One example is Naval Blockades, but I'm still puzzling that one.