I never worried about it at all. There's holes in the keyboard and through the laptop to deal with liquid spills. The case was a nice hard plastic with enough flex to prevent breaking.
Honestly, if I dropped it on the floor - I'd check the floor first for any damage.
Taking it apart was straightforward, albeit a bit frustrating. I found the MBP mid-2012 unibodys much, much easier to take apart and clean.
I recently decided to upgrade and bought a M1 MBP Pro off of a college kid wanting to get a gaming laptop. It's a huge upgrade and I actually find myself loving MacOS. Everything feels so nice and looks so nice.
But now I am just terrified for this laptop. It has a hard case. I'm meticulous about a clean keyboard and screen (fingerprint magnet). I keep any and all liquids very, very far away. I never place it anywhere where there may be dust.
I sometimes wonder if the stress is worth it. I'm tempted to buy myself an X220 or something else in the X series since the T530 was heavy to lug around.