Also, First Age stuff tends not to require maintenance.
Repair if damaged, sure, but not routine maintenance.
Only if the design goal was to avoid the need for maintenance.
The Solar Exalted of the High First Age had a ridiculously rich and powerful socio-economic infrastructural backing them up, and none of them expected that Age to end. Why design artifacts with Ragnarok Proofing in mind when you don't expect Ragnarok? Most of them would thus build ridiculously expensive and costly toys out of boredom.
A few of them DID focus on making stuff that didn't require maintenance. And yes, any First Age, Solar-made artifact designed to survive anything would, in fact, survive anything.
It also wouldn't provide nearly as much Bang For Buck as the trophy pieces of the other Solar Exalted going hog-wild with their creations in an attempt to out-do each other.
As to magical girl outfits like Nanoha's Barrier Jacket, there's also Pearlescent Filigree Defense, of Dreaming Pearl Courtesan Style.
Pearlescent Filigree Defense
Cost: 1m; Mins: Martial Arts 2, Essence 1; Type: Reflexive
Keywords: Mastery
Duration: One scene
Prerequisite Charms: None
An iridescent sheen comes over the martial artist's garments as Essence enfolds them, turning silk as strong as steel. Any clothing the martial artist wears while this Charm is active is treated as mortal light armor. This is explicitly compatible with this style, but not with any other styles that forbid armor. In addition, whenever the martial artist is hit by an attack, she may spend up to her (Appearance) in motes, adding one point to her armored soak against that attack for each mote spent this way.
Mastery: The first time the martial artist uses this Charm to defend against a decisive attack in a fight, she reveals the supernal resilience of her seemingly vulnerable figure, gaining hardness 10 against the attack as well as a surge of three motes that can be spent to add to the armor's soak, or on similar effects, such as many Solar Resistance Charms. These motes vanish at the end of the scene if not spent.
Using a Charm like this represents how mages in
Lyrical Nanoha can make and maintain Barrier Jackets without Devices (artifacts) at all. Just like that spell, this Charm is also a dirt-simple, universally-available trick.
Using the Form of the Style upgrades the "mortal light armor" effect to "artifact light armor" levels of protection, in addition to letting your magical girl stunt cute little energy projections from her hands ("needles of nacreous Essence spiking from her fingernails", which can strike out to short range).