Thanks everyone for your experiences and replies.
I have been a PC user for nearly two decades, my last PC was one that when I built it, I loved it, and so I maintained it well. I did a thorough dusting of all the tower components every 6 months (sometimes earlier) to ensure the cooling was optimal. Dust that is trapped doesn't allow optimal cooling to happen. I think this is what enabled me to ensure it's incredible longevity of 13 years going strong and even then it wasn't broken, I just got a hand me down PC faster than that one, otherwise it was still working like clockwork.
Point being, that enabling optimal cooling/ventilation ensured the computers long lifespan greatly and I didn't have any crazy water cooling thing going on just a normal setup with 2 fans. One in the front, one in the back and the CPU heatsink+fan inside the tower.
So while I believe having the MBP which is a different thing all together, in clamshell mode, it just doesn't make sense that it'll be optimal because heat is still dissipated from the keyboard and the surrounding surfaces and heat is a killer of electronics. In this case it sounds like you can still do pretty well for 4-5 years but have yet to hear anyone cross those milestones in clamshell mode.
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All I'm saying that in my personal opinion it increases the risk of failure vs someone not running in clamshell. How much I could not quantify without some kind of surveyed data. Again I noted in my post there's others who have 5+ years with no issues, I did not debate that. To your point, what if something happens 3 years and 1 day later?
I agree that it would increase the risk down the line. Maybe I should just upgrade every 3 years to mitigate that risk, that's one way to go about it it.
You bring up an interesting point. I'm sure Apple has accounted for the MBP's heat dissipation needs whether it's in clamshell or laptop mode, but if you're concerned that you're overheating your machine, why don't you just get a stand that will allow you to use the MBP as a second monitor with the lid open?
My new 2016 MBP replaced a mid-2012 that I used extensively in clamshell mode running some very heavy processes. The fan was always running. The only failure I suffered was in a cable that connected the wireless card to the logic board. That happened after four years of heavy use.
I would find the extra monitor from the laptop to be distracting if it were open, that's why I prefer it closed. Dual monitors or more actually don't help me as well, I do better working on one thing at a time.
Also... Apple's recent laptops have gorgeous HIDPI screens. You should use them for something.
Even if your big 4K screen is centered on your desk... leave the laptop open for a 2nd screen.
Seems like a waste not to have it open for something.
Hopefully when I'd be moving around or travelling is when the screen would get used. This is just a seamless way to have one computer that can act as a desktop and a laptop if required, without buying an iMac + MBP. Also all the data is one convenient place, although that makes it risky too in some respects. But I do like the iMacs, it's just buying both is just overkill when it comes to price.
It definitely is risky and will shorten the life of your MacBook Pro. My advise is always buy a dedicated desktop machine to compliment your laptop. Apple makes some phenomenal desktop computers including both the stunning iMac and the insanely powerful Mac Pro. I can't think of a single reason why anyone would want to use their laptops in clamshell mode while Apple is still making great desktop machines.
Are you speaking from experience? Please tell us some more details.
Yes but having the fans operate at 100% when I connect to two monitors is not acceptable. My 2016 one is completely silent. It is also proven that the older laptops needed to be thermal throttled if you are running an intense task for some time. While the newer ones are more silent and less prone to thermal throttling.
Is the 2015 MBP still considered as one of the older MBP's with that thermal throttling issue?