At least you can replace it quickly if you find it broken. Back then, we could only afford to make an update once. When you mailed out the update disk, you had to charge for it ($10 or so, disk, mailing container, printed instructions, postage, and label); if you sent out 100k bad disks, you had to eat $1M. If it was version 1.0, it went into a box and was shipped to distributors, retailers, and mail-order, and you might never even know who the end user was.