Resizing has to happen regardless of the ability to delete a key, unless you know upfront how many entries you're going to add; I'd be much more worried about a home grown hash table's tuning to rebalance itself at say, 80% buckets full.
If you _do_ know how many entries you're going to be adding upfront, you probably don't even want a hash table, you're probably better off with an array!
You didn’t answer my question.
> I'd be much more worried about a home grown
This is rhetorical framing.
As a knuth reader you should know then when you look inside the box you find some other idiot’s home grown thing who never read the research.