For this to be valid those would have to be 100% drop in replacements, and they are not. 'superior alternatives' are almost by definition not drop-in replacements.
Yes, it's not a drop-in replacement. How do we get a drop-in replacement?
My take: as customers we have to pay for incomplete solutions and then be vocal customers. Take my money! This is the way. Otherwise "free" and "open source" solutions will just never reach the level of quality needed to take off.
I think the definition on Wikipedia is correct, otherwise a "drop-in" replacement is no different than any other replacement, making it a meaningless term.
> [Drop-in replacement] refers to the ability to replace one hardware or software component with another one without any other code or configuration changes being required and resulting in no negative impacts.
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