The web browser app should be defined at the system level by defining your default apps in Android. Search engines can be defined in the "search settings" of KISS.

It really depends on your needs and what's important for you in the services you use.
For personal use I go with disroot and k9 for client. Here is a quite detailed overview
But they also more than email service: cloud service, collaborative tools, messenger service, calendar and tasks,, paste bin...

Don't know if you plan to use another Arch-based distro on this laptop in the future but I came across this page which has some tips to adjust the Framework 13 including one that may be related to what you mention. They recommend to use 1,5 scaling factor. More details can be found here.

@dream_weasel Did that help?

I used dwm for few years before moving to bspwm.

Right, I totally agree. If I would have to deploy my config on several machines or create dedicated config using a common base then I would have been convinced. I'm still not convinced from a dummy single user point of view but I still believe in this distro and like its approach so I'll continue experimenting with it and we'll see where my journey leads me.

At least for now I'm glad to have a new toy I can mess up with. With my Arch system I was getting this weird feeling where I was happy to have an efficient and stable machine while at the same time being bored to have nothing to test/tweak/destroy and rebuild. I mean I love to learn and discover new things so I experiment a bunch of applications and parameters I will never need anyway but it becomes harder and harder to find something that keeps me entertained for more than a day.

Due to the still early development of NixOS, Home manager is in some ways very similar to nix-env and flakes is still highly experimental. Also, the configuration parameters are changing quite significantly with the distro development. I'm sure this will all settle down when the distro will become more mature but to be honest that's also what attracts me. I like chaos ^^ Seriously, this shows me some potential for great achievements. I will continue testing NixOS but for now I didn't find THE reason to leave Arch yet. If I would have to deploy my config on several machines or create dedicated config using a common base then I would have been convinced. Will see where my journey leads me.

Got it. So you can rollback without Internet access. I get that point and Arch can also do that with pacman -U. Again I feel like I'm just stupid and am missing something. Like I said I genuinely try to figure out what it is. NixOS would be the only distro I could consider switching to and that's why I'm currently testing it.

Can you elaborate? I messed up DNS when I started with Arch and it was easy to recover from that. For text editing, I'm using neovim and can go back with undotree. Of course, if I delete my file and remove it from the trash it's too late. Can you recover deleted files with NixOS?

I don't understand very well the purpose of the bed lock: it basically avoid the "calibration screws" to accidentally "unscrew" while the printer is working?

You are correct. The screws will move a little bit when you print which will result in your bed being unleveled after few prints and you'll have to recalibrate your printer. This hack will eliminate that so you will have to level your bed less frequently (because as others said, leveling your bed will be needed for other reasons).

What was your issue with the webcam? It may depend on the distro but mine works well even though I almost always use an external camera instead because most webcam quality sucks on any laptop and OS anyway.

Supporting Linux/open-source companies is certainly a plus. Not that there machines will work better but it makes more sense if you really want to adhere to the global philosophy of open-source. For the record I still didn't go that route because either I couldn't find the right machine or the price was significantly higher for similar products and I didn't take the "risk" to spend more without enough certainty on the build quality. Experience varies and I'm sad to say that I convinced a friend to switch to Linux and he immediately jump on a Tuxedo machine but unfortunately it had a lot of issues out of the box. One remains but I will not blame the company for this one (compatibility with a hiDPI external monitor).

If you're using only one monitor, simply duplicate and scale your laptop screen instead of using the extended approach.
To give you a rough idea, this will look to something like this:
xrandr --output eDP1 --mode 1366x768 --scale 1x1 --output HDMI1 --same-as eDP1 --mode 1920x1080 --scale 0.711x0.711
Use xrandr to find the monitors names and resolution. The scale option is simply the ratio between your 2 resolutions.