For context, ** on the WT side:

• Positioned cursors: stable lookup already skipped, no change needed
• Unpositioned cursors: this is where blind writes would help with standby performance

From mongod's side:

• Collection deletes: always positioned (explicit stable reads), so blind writes won't help
• Index key deletes: mostly unpositioned, so this is where the benefit would be

So workloads with frequent index key modifications (TTL indexes, updates on indexed fields) would benefit from blind deletes.