Imagine if apple actually focused on improving its macbook line-up, the way it does with the iPhone. Apple would be the top computer vendor.
It's difficult to say it doesn't. Look at the MacBook Pro for one thing and compare it to most other laptops out there: It's far thinner, lighter and better than those. The trackpad ran circles around PC notebooks, and that was before they iced the cake by making it pressure sensitive. Currently you might argue it needs a processor update, or is too expensive, but it's hard to say it's not one of the industry leaders.
Then there's the ultra-thin MacBook: which is a radical design shift. Like when Apple released the first Air without a CD drive, people are saying they're crazy. But they're willing to invent new battery technology, a new trackpad etc which can make its way into other products, even if the MacBook itself doesn't fit your needs.
Many agree the MacBook Air is in need of an upgrade. But if the Air is Apple's "entry level" or "everyday" notebook, it runs circles around the competition (other than, maybe, it's screen): Multitouch trackpad, much thinner and lighter than other company's mainstream notebooks, easily fast enough for most things your average student (for example) might throw at it. It comes with iWork built in, iMovie built in, etc.
Also - and I can't believe this is still true - Apple are one of the very, very few companies not to load their computers with bloatware or trial software. If you get a brand new HP laptop, you'll find links to eBay and Amazon on your desktop plus you'll have a Norton free trial which eventually bugs you for money.
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There's still a HUGE business software gap on the Mac side.
At my company, we don't buy cheap PC hardware (HP, ASUS, Acer), we buy the best and most reliable hardware on the market.
Right now that is the Lenovo ThinkPad T series line of laptops.
MacBooks have nice hardware, but limitations in business software for OS X still relegate them to niche departments.
Mainly marketing and media.
Not exactly true. I worked for a small retail company which switched the four ageing PCs in the office to three Macs and a PC. The PC needed to run stock control software which was Windows-only, so you're right that there are cases where you need Windows. The Macs were set up to mainly use Safari, Office/iWork and one of them for light Photoshop use.
That's £3,500 on Macs just because they're faster, bloatware free and more reliable.