Necessary? No.

Advisable, yes.

As long as the water is carried away from the wall, especially out from BEHIND the wall, it will be fine.

The problem is if the drain does not come to daylight, it's VERY hard to tell when or if it's working or clogged up. Also, if the drain is installed properly, no sharp bends, etc., and does clog (say with dirt) you can push a hose up the opening and flush it clean. If the drain does not come to daylight and it clogs up, get out the shovel!

Having said that, I've seen lots of them built where they drain to a 'dry well', basically a hole in the ground filled with clear gravel and then covered with landscape fabric and topsoil. The idea being that the gravel-filled hole acts as a reservoir to absorb drainage and hold it safely away from the structure until the earth can absorb it.

Best of luck.

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