As an AI, I’m unable to write a full 15,000-word article here due to text limits. But I’d still more than happy to provide a detailed overview of the topic:

The narrative about succulents often revolves around their low-maintenance properties, drought-tolerance, and aesthetic appeal. But, despite the carefree lure that their nature evokes, they come with their peculiar demands. One such demand is the necessity of drainage holes, an aspect so crucial that it could make the difference between a thriving succulent and a swimming one.

What Are Drainage Holes?

Drainage holes refer to the openings present at the bottom of plant pots. Their primary function is to release excess water from the pot, creating an optimal environment for the plant’s root system. For succulents, these holes are of paramount importance due to their unique root system’s features and watering needs.

Why Do Succulents Need Drainage Holes?

Succulents are recognized for their turgid, fleshy leaves, stems, or roots that store water. Therefore, they are naturally equipped to thrive in arid regions with low rainfall and and porous soil that drains water quickly. They’ve developed an incredible ability to store water for long periods, thus sustaining during drought. Imposing conditions unlike their native habitat might result in unfamiliar problems for the succulents.

Overwatering is among the leading causes of succulent deaths, primarily because it leads to root rot. More often than not, the killer isn’t the water, but the inability of the water to exit the container that causes succulent downfall. This is where drainage holes become lifesavers.

How Do Drainage Holes Help Succulents?

1. Preventing Water-logging: Drainage holes reduce the chance of water logging, saving succulents from detrimental conditions such as root rot. They allow the excess water to leave the pot, preventing the roots from becoming submerged in water.

2. Allowing Air Circulation: These holes promote aeration in the soil by letting in oxygen, something roots need as much as water. Additionally, they facilitate the exchange of gases at the root level, promoting healthy plant growth.

3. Encouraging Robust Root System: Drainage holes promote a strong and sprawling root system. When roots sense a water shortage, they “work harder” to reach out and absorb more water, leading to a robust root system.

4. Managing Nutrients: They assist in nutrient management. Overwatering not only drowns plants but also washes away vital nutrients. Drainage holes moderate the seepage of water and maintain an optimal nutrient level.

Can You Grow Succulents Without Drainage Holes?

While it is possible to grow succulents in containers without drainage holes, it’s tricky. The margin of error is minimal, and the risk of root rot becomes considerably high. If the container doesn’t allow the extra water to be expelled, the water will pool at the bottom, creating a swampy haven that your desert-loving succulents would despise, with a high chance of their succumbing to root rot.

However, if one decides to opt for non-draining pots for some reason, there are ways to go about it:

1. Water Sparingly: Be very cautious about watering. Light watering, often referred to as ‘sip’ watering, can be implemented. Measure the water well enough so that it is just sufficient and doesn’t allow accumulation.

2. Create a Drainage Layer: One popular workaround is creating a faux-drainage system. A layer of coarse material (like pebbles or charcoal) is laid at the bottom of the container. This layer will act as a reservoir for the excess water, keeping it separate from the soil.

3. Use a Well-draining Soil: A well-draining soil mix can aid in preventing water accumulation. A mix of sand, perlite, pumice, and potting soil often works well.

Choosing Pots with Adequate Drainage Holes

While selecting pots with drainage holes, consider the size and number of holes. Large pots need more holes to ensure effective drainage, or larger-than-average holes. Conversely, small pots will be well serviced by a single, small hole. Moreover, the material of the pot also influences the drainage. Unglazed ceramic pots are porous and allow some amount of water to seep out through the sides, aiding in drainage.

In conclusion, while the task of nurturing succulents without drainage holes isn’t entirely impossible, it is undoubtedly challenging, and for beginners, it may be best to start their succulent passion with containers explicitly designed with drainage holes. The importance they hold in preserving the plant’s overall health and vigor is unquestionable, making them an integral aspect of successful succulent horticulture.