Burial insurance is a very old type of life insurance which is paid out upon death to cover final expenses, such as the cost of a funeral. The Greeks and Romans introduced burial insurance c. 600 CE when they organized guilds called "benevolent societies" which cared for the surviving families and paid funeral expenses of members upon death. Guilds in the Middle Ages served a similar purpose, as did friendly societies during Victorian times.
Your point about eventually not having to pay premiums is a common one used by agents, and in some cases that does happen. But in many cases it doesn’t, or at least it doesn’t happen as early as is illustrated and the policyholder is left paying premiums for longer than they had anticipated. The point is that this is not a guarantee, and it’s important for people to understand that.
"Flexible death benefit" means the policy owner can choose to decrease the death benefit. The death benefit can also be increased by the policy owner, usually requiring new underwriting. Another feature of flexible death benefit is the ability to choose option A or option B death benefits and to change those options over the course of the life of the insured. Option A is often referred to as a "level death benefit"; death benefits remain level for the life of the insured, and premiums are lower than policies with Option B death benefits, which pay the policy's cash value—i.e., a face amount plus earnings/interest. If the cash value grows over time, the death benefits do too. If the cash value declines, the death benefit also declines. Option B policies normally feature higher premiums than option A policies.
Any death benefit of the policy will not be payable if the named insured commits suicide or if anyone covered by additional riders commits suicide, while sane or insane, within two years from the policy or rider effective date. All premiums paid will be refunded, less any indebtedness. The following information only applies to the Accelerated Death Payment, Waiver of Premium Benefit Rider, and Accidental-Death Benefit Rider:
Adjusting liability insurance claims is particularly difficult because there is a third party involved, the plaintiff, who is under no contractual obligation to cooperate with the insurer and may in fact regard the insurer as a deep pocket. The adjuster must obtain legal counsel for the insured (either inside "house" counsel or outside "panel" counsel), monitor litigation that may take years to complete, and appear in person or over the telephone with settlement authority at a mandatory settlement conference when requested by the judge.
My argument is based on the fact that whole life insurance is often sold as an investment, and therefore many people buy it as an investment. I am well aware that there are other reasons people buy it, and those are explicitly acknowledged in the article. The rest of your questions have already been addressed in both the article and other comments.