Every of the lightning talks itself had about 20 short different topics,
And as I wrote these were examples, you didn't expect someone to re-enumerate them here all to refute your statement. You can easily find them yourself.
Have look at this page, where others listed their favorites, there are many more.
But I don't think from your reply you didn't look at the list of sessions yourself.
As someone who has been following the congress for twenty years (and if I couldn't be there, I watched streams and recordings), I have to say once again that it used to be better. The selection of topics was broader and more interesting. About fifteen years ago, politics entered the picture, and over the years it has become more and more prevalent. Strange people began to appear, and about ten years ago, this event ceased to be a cozy meeting place for hackers and geeks. I am very sad about that.
51 Ways to Spell the Image Giraffe
Who cares about the Baltic Jammer?
Asahi Linux - Porting Linux to Apple Silicon
The art of text (rendering)
Excuse me, what precise time is It?
DNGerousLINK
CPU Entwicklung in Factorio
How to render cloud FPGAs useless
Breaking architecture barriers: Running x86 games and apps on ARM
Cracking open what makes Apple's Low-Latency WiFi so fast
Reverse engineering the Pixel TitanM2 firmware
Not To Be Trusted - A Fiasco in Android TEEs
Celestial navigation with very little math
Textiles 101: Fast Fiber Transform
Escaping Containment: A Security Analysis of FreeBSD Jails
Don’t look up: There are sensitive internal links in the clear on GEO satellites
Opening pAMDora's box and unleashing a thousand paths on the journey to play Beatsaber custom songs
Lessons from Building an Open-Architecture Secure Element
And of course some of the Lightning Talks...