This has three main issues.
1)Tedium
I'm highly skeptical of a player actually enjoying having to take time out of their gameplay to spend a few seconds extra on things like taking a shower, washing their hands, taking a dump, and drinking a bit more considering people already complain about having to eat food once in a while. It's not uncommon to end up completely absorbed in your work to the point where you actually ignore the meters on the right side of your screen, and when that occurs, if you force and action every few seconds or cause some form of debuff, you begin to create something that's not as immersive as it is incredibly annoying and detrimental to the experience.
2)Time
The round time as it stands is in a nice spot right now where it ends around the time where things start to really wind down or get destroyed, with a system like this, the round will slow significantly due to new necessities, as well as limit the availibility of some important roles and other jobs. Due to how busy some departments can get and how often you need to be mobile, this wouldn't help out many of the more time constricted and busybody jobs.
3)Population
While people can enjoy the added necessities, many will not, and this will mean a drastic reduction in the amount of players on the server, besides the people who can appreciate or enjoy a system like this. This isn't to say the system itself is bad, just that the system itself will likely not be enjoyed by the larger part of the population without serious adjustment or flat out removal if it were added. If it was enjoyed, population fluctuations are a real problem, and because this system would be on most people, it would end up causing crowding where there otherwise wouldn't be, even with a number of additions.