I don’t really understand your point. The 2007 MBP still runs current software & has specs which still equals many of today’s entry level machines.
My current MBP (which is actually late 2013) has the following specs:
http://www.nissanpatrol.com.au/forum...id=61823&stc=1 & also has a 500GB SSD drive. I wouldn’t have called that ‘under spec’d’ & I’m not sure what you mean about the OS being light weight. It certainly has it’s differences to Windows, but I would have said it was just as capable & if (?) it needs less resources to run it, then surely that can only be a good thing?