Dropping Torva parts on death ONCE costs 500k for helm & 2m for legs to fix it at bob, but there's no point to fix it because you can brake it infinite times and it will still work.
After 5+ deaths without fixing it I was still able to use. I brought the parts to bob and the fixing price was still 500k for helm and 2m for legs.

and it also loses the "check-charges" option after 1 death.

You can still use ancient armours after death, but they are in a broken state which gives no bonuses. Can you double-check to make sure this is the case?

I checked the stats and yes it does give 0 bonuses as broken, but what's the point of being able to wear broken armour?

People like me (that don't really check equipment stats) might not realize that for a very long time and lose lots of time & supplies just because you're able to wear the armour with 0 bonuses. for example: after dying at nex with the armour you don't go checking equipment stats because you want to continue killing the boss asap.
My brain: if I can wear it, it works.

To make it fair for players I'd suggest making those broken armours unable to wear just like Barrows because I've lost a lot of time and supplies only for being uniformed about the broken stage. If I recall correctly there were 4 breaking stages every 5k charges since the release of Nex. So since then I thought it can brake until it becomes impossible to equip it.

It's fine, just making sure the actual system isn't bugged and can be abused. I'll patch the game and make the items not equippable to avoid the confusion. Thanks.