You are naming companies that already have the staff and the infrastructure in place. Maps is a new venture for Apple. Sure, they have some staff but obviously the ones in place botched it up by most of your accounts - so hiring new, more senior people, and putting in a better way of updating/fixing things take time.
This doesn't even have to do with understanding corporate politics - but more, understanding common sense.
It's been nearly 4 months since they were made aware of the problems.
----------
I don't know about Bing and Waze but Google has 7,000 people working on maps at any given time. With the amount of wrong data (in the millions?) and corrections coming in, it can take a very long time to see corrections. I read somewhere that Apple has about 200 people working on maps. I would guess that only a certain percentage check the incoming corrections. The math is overwhelming at this point in time.
I couldn't care less how many people Apple has employed or how big of a problem it is for them.
I had maps that worked and, if I found a fault on them, I knew it'd generally be fixed within 2 weeks.
Apple took that away and forced me into maps that barely work in my area.
I don't see it as unreasonable to expect the same as what I had a few weeks ago... and, if they couldn't deliver on that, they shouldn't have promised the world (literally) and forced it.