Depends on the “average” person You are allowed to stop reading at any point!

generally:

• if one only uses the browser anyway why not use an os that is easy to install, gets updates for like forever, can run on a potato and just works
• it supports more hardware (especially that it does not require tpm) making it cheaper when choosing used hardware + is more resource efficient
• It has no ads build in
• being able to drag games fullscreen from one desktop to another with windows key* pressed and mouse drag (at least arch + plasma)
• users being able to choose their own difficulty from easy and less flexible (mint) to specific (bazzite, looks like a games console but for steam) to advanced (arch) and further
• no account needed to use it (+ no nag screens except maybe on install but way less than windows)
• able to be installed on a USB stick and be used on every pc that lets you boot from it, can even be tested without install
• Installing software is much easier and safer as one does not need to visit some website to download an exe but only needs to open the program store or look up the name and then simply copy paste something in the console and press enter
• a lot can be updated at once, not only the system but programs as well with one simple command (or the update button in discover or something like that)

*dont really know how else to call it XD

specific: gamer -> proton works wonderful to emulate win games that have no intrusive anticheat (protondb is your friend) office -> open office or if they want a more ms office thing Softmaker (but its paid & some things are not supported, has no subscription options tho) artist -> gimp and krita are your friends

cons (to be a bit fair):

• some things (like how to download programs) can be massively inconsistent between platforms (glancing at ubuntu)
• its not windows and will never be so it can be challenging to adapt (like using the console or installing programs)
• MS office is not native to linux and needs compatibility layers (like proton or wine) or even a VM
• could be a hassle for students or workers where MS software is required

Sorry for the dump, i am not sure if i properly answered your question or you got what you wanted to know