Ferrari and McLaren cars are a very exclusive club. Ferrari, to my understanding, explicitly limits production capacity to maintain that exclusivity. The practices of these two companies are in no way comparable to the practices of a large-volume automaker.
After almost a complete decade I'm down to 78-84% of the original battery capacity. Before buying a tesla, i investigated the cost of replacing the battery out of warranty though Nissan. The cost estimate i got on the phone was over $14k.
That's for a battery about 1/3 the capacity of a tesla battery.
Tesla has a reputation for their batteries catching fire less than their competitors... not letting people hack up their batteries has a large part of that. Allowing 0.5% or however many people ruin their battery risk their own safety for cash would impact the perception of tesla battery safety far more than 0.5% so it is obviously a smart move to preserve their reputation, in a manner consistent with mclaren insisting on applying their own special glue in Woking to preserve the reputation of mclaren roofs not coming off.
Daily Driver ferraris and mclarens are also laughably expensive to maintain as /the norm/ Unlike this defective battery which is /an exception/
also the "going to landfills" bit is really FUD. Tesla repairs your vehicle by installing a new battery, and tesla recycles the old battery themselves. The loop is as small as possible and there is no landfill in it.