And if there is no path forward to resolve the bugs? How many rough edges and bugs can you tolerate before a system is no longer worth investing in, especially

And if there is no path forward to resolve the bugs? How many rough edges and bugs can you tolerate before a system is no longer worth investing in, especially when another newer system does not suffer from any of those bugs? To say there is no tipping point where the cost of continuing to use a system which no longer fits your needs exceeds the cost of migrating to a system which does (and will continue to) fit your needs ignores some amount of common sense.