I am debating building my own vs the Alienware 11.  I would appreciate any feedback from the many informed users I have noticed who post on this forum.  I am thinking about a an i7-10700 cpu (non-clocked), with the NV 1660i.  I will configure with a 1 TB M2, and then slap in 1 x 2.5" 500GB SSD and 2 x 3.5" 1TB HDD in the bays ( I will need to change one of the lower bay cages.)  I am not a gamer (nothing against gamers) but will be using it to run heavy web surfing (40+ tabs),  streaming and occasional video editing.  Here are my concerns:

Cooling.  Lots and lots of concerns constantly on heat issues with XPS and Alienware.  Mostly coming from heavy gamers I assume, but I still have concerns with the small Alienware case, inferior OEM fans, tight spaces, etc.  I have never had liquid cooling and the idea of putting anything liquid inside a computer freaks me out.  Also I see you have to change out the fluids on the AIO pumps after 20000 hours which means after a couple years, I am going to have to change (or work on) the pump. I thought about going with air cooling but the heat sink on the A11 looks inadequate. 

Questions (assuming the above build):

(a)  Do I need the AIO liquid pump or can I go with air cooling?

(b)  Should I worry about an AIO liquid pump and what maintenance concerns, if any, should I factor in to my decision making?

(c)  Can you put a better CPU sink/fan in the A11?  Can you put a better AIO pump in the A11?

(d) Any thoughts on the CPU or GPU selection?

Thank you for taking the time to review my questions.  All replies are appreciated.