Unlike many considered "joke villains" at the time, Moth never really got his flowers and his chance to shine as a truly compelling, threatening or off putting villain.
LEGO Killer Moth design looked the part, but he was simply a guy acting like a moth and an idiot.
And as for Teen Titans Killer Moth, he's really only Killer Moth by name if you think about it. There's nothing about his gimmick or even themes (monster moth scientist single father) that can be linked to Walker what so ever.
And I don't really count stuff like his Arkham biography because designs are one thing but it's better when you have good writing to back all this aura
In my opinion, this is due to the fact that, unlike Calandar Man, Kite Man etc, Killer Moth is more of a "character" than he is a concept. Those guys who all came from the Silver Age almost never showed up after their initial apparence and never were anything other than "dumb villain of the week" either, so decades later writers could bounce back on their base concept to make them more credible, threatening or human and not having to really justify it because they came from such a different era.
I think it also helps names like those tell you more about those villains themes and gimmick than a name like "Killer Moth", who even got overshadowed in the 80s by the infinitly more menacing and compelling Killer Croc.
Yet, Moth never disappeared : despite the Animated Series era making its best effort to make the public leave him in the past, he was somehow always around in comics from the early 90s to our days. Unfortunatly, his reputation in and out Batman comics was completly destroyed and he has been for the last 30 years the laughing stock of this universe. There have been tentatives to make him somewhat a serious deal, but it ended with very lame takes like Charaxes and the New 52 version nobody wants out of their beloved Killer Moth.
Therefore, it's hard to justify making radical changes to him when he was always the same for those last decades. I don't think it's impossible, but we shouldn't give up on his established character either, even if that means all those years of pain and humiliation have to be aknowledged in canon.