I leave my TH outside, unprotected. Right now, if you were to raid me, you would have 400k elixer, 400k gold and 3k oil avaialable. People just take the TH snipe.
I wouldn't call my TH10 weak. All defenses were maxxed before I clicked the button. When my defenses were maxxed as a TH9, just working on walls, I would get raided about 20% of the time and owned by TH10s while my TH was exposed. Now, peopel go for it only 5% of the time and the last few attempts didn't make it to my oil storage.
What makes a TH10? Troops, Infernos and max defenses. I set t up so I had 8m gold in storage, CC loot makked (about 1.5m more gold) and collectors full. Elixer maxxed, too. As soon as my TH was done, I had two ITs building and my first max troop being researched. I didn't spend much time as aTH10 in a TH9 body. I gather all loot much faster now than when I was TH9, so I beleive I have accelerated my upgrading over the grind schedule.
Had I grinded along and maxxed all my walls, people would have continued to air raid me. Walls don't work as well when people just go over them. If you want to max everything, more power to you. I'm just offering up an alternative view to the "max every single little thing" standpoint.