Death timer doesn't matter. Cloning exists. And like cloning, after 20+ minutes of being dead the player may not be interested in returning to the round if they are still there.
IPCs are no easier to repair than any organic is to heal. In fact, it takes much more effort to heal IPCs than it does to heal organics even without considerations for things like NewCrit.
BS You say? Oh I argue strongly. Welders heal 15 damage max and a cable coil heals 3 per length with a max of 24 burn heals, compare to brute and burn kits healing 25 each. Chemistry patches can heal much more than this, with styptic, silver sulf and synthflesh all capable of healing 100+ damage across the entire body instantly.
But welders and cabling are common! They say, but round start a very generous estimate puts there to be maybe 10-15 complete sets of tools in public access, with 30+ assistants in a round if you don't grab them immediately they won't be available to an IPC hoping to repair themselves after the first 5 minutes of a round. But Cargo and Science can make more tools! And Medical and Science can make more healing patches. Far easier and without reliance on Mining to do a thing. Botany can make healing plants and anything with nutrition will heal the organic that eats, so the Chef's food, the donuts in security to the junk food in vendors will all heal an organic based upon how much nutrition, protein and vitamins are in the plant.
But IPC surgery can be done anywhere! So can organic surgery. IPC limbs break faster and break from more sources. Burns don't break organic limbs, but IPCs need surgery after eating a few lasers. Going into crit doesn't cause an organic's ribcage to suddenly implode. But an IPC takes constant brute while in crit across their whole body, meaning a single person trying to repair 200~ damage may find themselves repairing over 400 because of how asinine the repair goes. IPCs also bleed from less damage dealt to them compared to organics, and do not regenerate their oil blood at all, where as organics can regenerate blood from food, saline and iron intake.
TL;DR Easy to Damage, Easy to Repair is a myth. Only the easy to damage part is true. In every other sense organics have advantage when it comes to reliable means to heal and return to a round if their body can be found. If IPC buffs were nearly as potent as people made them out to be, how come nobody uses Prosthetic limbs, which are available to literally everyone and carry all the same pros and cons as IPC self repair. Because IPC healing is inconvenient at best and a time and effort time sink in its worst cases where the tools available to heal robotic crew are laughably underpowered compared to anything a competent medical bay can accomplish.