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My landlords wife yelled at the plumber for sealing our bathroom wall back up when the shower spigot was still leaking, and then her husband comes in and says "honey stop we don't need to pay to fix the valve if we don't have to". So my shower still leaks and they really fixed nothing because they didn't want to spend $1000 (less than half our rent) to redo the shower.
Wouldn't the leak cause more damage to their property over time?
It's hard to know what terms OP used correctly, but sounds like maybe the bath spigot is leaking a bit while the shower is on. If that's the case, it wouldn't cause damage to not fix, the shower water pressure would just suffer. And AFAIK, you wouldn't typically need access to inside the wall, unless they did something stupid and tiled in a way that you can't access the diverter stem nut to replace it.
IANAP, just DIY and have had to replace shower stems due to failing gaskets