Thank you for posting
In general IceWM can be nice and I don't deny it. You probably need to do some work on the configuration.
As for dmenu / rofi, it is possible. But it seems to me that as IceWM provides its own menu, there is no point in using another one - unless for quick application launching (as in Xfce4).
It seems to me that if someone wants to use OpenBox, i3 or IceWM, they are more likely to spend some time on the configuration.
When you first install it, of course you have to configure it to your own liking, I think I spent 2 days setting up Openbox to my perfect liking when I first installed it. Since then, it has been 3 years, and I have the same Arch Linux with Openbox already set up. I have migrated it from one laptop to another laptop, and from the 2nd laptop to my actual PC, NO NEW install, just move everything.
About menus, Openbox also has its own menu, I never ever use it, I'm using Rofi, I have a shortcut on my keyboard, I start to type 1-2 letters and Rofi finds the app I want to open for me. Yes, it's for quick app launching, I never like to use the mouse to navigate through menus, it takes too much time...
Also about browsers, did your ever try QuteBrowser? No need to use the mouse to browse the internet, only the keyboard is enough. :))
Well, I tried QuteBrowser, but I am not keyboard master :D Don't get me wrong, I want to support everyone as a FOSS Dev, but you have to "waste" a lot of time to learn how to use i3, qutebrowser etc.
I'm also not sure if Qutebrowser is available for Termux. I like an idea where you can change your phone into PC (That's why I support this project). Mobile phone processors have nice performance (ofc. not like a gaming laptop, but ultrabook).
I think I lost something in the translation, I do not understand what do you mean by Qutebrowser to be available for Termux, QB is based on QT platform and Chromium, I don't understand what Termux has to do with it, but anyway, they are 2 separate tools.
In a few years when 5G and 6G could work reliably, I think there is a big chance that all the heavy computing part will be done in the cloud so no matter if you have a phone, a tablet or a laptop, they could be running at about the same performance.