Apple's finite is larger than every other company out there (to quote an article from earlier this week). I'm pretty sure that any issues Safari is encountering is not due to Apple reaching a "finite" limit of any kind.
EDIT: Many of your responses posit Apple as some kind of underdog, struggling to make it in this industry. Given Apple's size and talent, this viewpoint is all but indefensible.
If having an industry leading browser it was a priority for Apple, it would get done. That it's not getting done indicates either that the developers are incompetent, or that the developers' efforts are genuine but being sabotaged due to politics. I'm inclined to believe the latter.
This is demonstrated by making certain features of application development on their devices only accessible by writing native software.
The simple workaround would be to write your own browser and put it on their platform. That is expressly verboten or else I'd already be using an iPhone running Firefox, instead I use and android that runs firefox and which has extensions since it's what it's users want vs what the payers of the browsers developers salaries want.
So the strategy MS used to buy years of revenue for win+office was to bundle a default browser to control the web platform and strategically hinder it whenever it threatened their core income centers. The default opt-out required momentum plus the fact that netscape did themselves no favors led to a dark age of web platform innovation as MS corruptly controlled the space and acted as negligent stewards.
What is totally insane to me is that a large portion of the Microsoft anti-trust trial revolved around them simply providing a default browser, it is hard to imagine even they would have blocked netscape software from running on their platform outright.
And yet here we are 15 years later and the iOS platform is doing just that, Apple is embracing this Microsoft strategy and extending it to a whole new level by flat out banning 3rd party browsers and so we all run the risk of having this great renaissance in browser application innovation extinguished into a second dark age.
Well, this is expected from a business perspective. Apple can't profit from the web as much as they do from the App Store, the only way to "convince Apple" is either by dropping their sales, or by regulation.
While they have money, their pay scale isn't famous for being extravagant. People work there mostly for prestige, but you can get money and prestige working for a startup.
Cook has said publicly that their biggest challenge is talent retention. They're obviously short-handed on OS releases, and willing to reallocate when necessary. So it is not surprising to me at all (but deeply disappointing) that Safari improvements would take a backseat.
Need more developers? Hire more.
Payscale problems? Pay your developers what they are worth to you. Of course, if they aren't worth much to you, then this point is moot.
Retention problems? Addressed by both points one and two.
That they do not use their resources to solve these problems says more than the fact that they have these problems.
They're aiming to increase their total number of Cupertino employees from 16k to over 24k in 2016. For any organisation, absorbing another 7k+ employess is no mean feat.
Apple is experiencing unprecedented success and fantastic growth. But sure, that's trivial to manage. You could do it in your sleep. Maybe you should drop Tim Cook an email.
How do you even find 8000 people who would want to live in Cupertino… I mean have you even visited that place?