This really depends on your perspective. To you it might not have been a staple, but to a high end healer it likely was:
https://www.youtube.com/watch?v=xlj5BQPQwnw
Oct 2013, long before patch 2.1, Note, healer doing significant DPS when cooldowns permit. Skip to 3:40 and check out the cleric uptime on the first boss, beastly!. Also note the gear, primarily Darklight with Relic weapons.
Random reddit discussion about how to deal with super long pulls in WP during patch 2.0 in 2013. People are already mentioning healer DPS potential despite how brutal some of those pulls were if you weren't boss gating them.
https://www.reddit.com/r/ffxiv/comme...derers_palace/
Waffle_Slapper 1 point 10 years ago
I usually let my hots do all the healing. I'll start with divine seal> cure2 > regen > swift cast > medica2 > eye for an eye > presence of mind > cleric stance > holy untill everything is dead or shroud due to aggro or mp.
Joffrey_is_so_alpha[S] 1 point 10 years ago
I wish you could come on some of my FC runs! I occasionally go with 2 other WHMs and a SCH, and we tear the place up with Holy spam. (Note this was from the OP who was complaining about the mega pulls in the first place!)
Basically, Nabril's choice of wording is poor, but he's not entirely wrong. Healer damage and it's value was pretty well understood and was a known quantity from pretty early on. People just generally didn't place much importance on it until Faust came along and introduced everyone to our future evil overlord, Mr DPS check.