My kitchen remodel is in progress. After ripping out existing cabinets we found that the plumbing for the sink drain cuts through a total of 7 studs, more than 50% through each (see photos). Contractor and I were originally worried that these were load supporting -- why else use 5 together? But contractor went into the attic, and said based on rafters this is not load barring. Consequently they are going to leave the existing situation. Next room has vaulted ceilings, and there is quite a bit of structure in the attic to support/implement that.
Should I replace the studs and somehow route the plumbing around, or is it ok as pictured?