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Swords against tentacles!
Is disease that big a thing in the average D&D game that it couldn’t fold into poisoned? I don’t think it was as common as poisoned was.
Of course, that depends on what you classify as "the average D&D game", but I'll just quote from the 2014 SRD:
"A plague ravages the kingdom, setting the adventurers on a quest to find a cure. An adventurer emerges from an ancient tomb, unopened for centuries, and soon finds herself suffering from a wasting illness. A warlock offends some dark power and contracts a strange affliction that spreads whenever he casts spells.
A simple outbreak might amount to little more than a small drain on party resources, curable by a casting of lesser restoration. A more complicated outbreak can form the basis of one or more adventures as characters search for a cure, stop the spread of the disease, and deal with the consequences.
A disease that does more than infect a few party members is primarily a plot device. The rules help describe the effects of the disease and how it can be cured, but the specifics of how a disease works aren’t bound by a common set of rules. Diseases can affect any creature, and a given illness might or might not pass from one race or kind of creature to another. A plague might affect only constructs or undead, or sweep through a halfling neighborhood but leave other races untouched. What matters is the story you want to tell."
The base 2014 SRD has 3 diseases (cackle fever, sewer plague, sight rot) and there are dozens more from third parties as the link above shows.
You could say "whenever you get a disease you are also Poisoned and removing the Poisoned condition will also remove the disease" but I don't see this as something that needed "fixing" in the 2024 rules, why not just leave it as it was?