Feature parity between Windows/Mac and Linux
I've started using Proton VPN in Windows, and it's a great app, full of resources, with great graphics, many resources, ability to auto-start, start minimized, auto-connect to a profile... The Mac version also looks very similar to Windows'.
However, recently I changed to Linux (Pop OS, Ubuntu based), and although I had no problems installing the GUI version of the app, it does not even remotely resemble the Windows/Mac version. It's a very, veeeeeeeeery simple app, without the majority of configuration options present in their other OS's counterparts.
Proton VPN team should dedicate more time to make the Linux version of the app the same that we see in Windows/Mac, so we can have in Linux exactly the same wonderful experience the app propitiates in Windows and Mac.

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David “phunman1” Jackson commented
Is really does throw some shame at you guys, I was sick of Microsoft farming data off of me, let me choose my own OS and let all the apps across platforms be the same.
I'm seriously thinking of downgrading to a free account because this is BULLSHIT you should treat Linux equally, even though it is superior to WINDOZE -
J commented
Aside from no wireguard the cli experience has been pretty decent. I don't bother with the app.
But boy do I miss split tunneling when I need it. -
Seth commented
If Linux was properly supported by Proton I would be willing to get Proton Unlimited and ditch Mullvad, but in the current state it just isn't worth it.
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[Deleted User] commented
Yes, I agree
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Can T. commented
Absolutely. It lacks many features the Mullvad APP or ProtonVPN for Linux app have.
Also, I can't understand why they would go with Python for the Linux app. It is less reliable and less efficient.
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SiriusHollowspell commented
Seriously, it doesn't even have Wireguard. WTAF!? Wireguard is a basic feature that every client should have. I can kind of understand taking forever to implement other features like port forwarding, (Mac OS was forgotten on this too) but no Wireguard is just insane to not have. I am very disappointed with the current state of the Linux client.
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SiriusHollowspell commented
The Linux client for Proton VPN is lacking every single feature of the other clients except the ability to connect to one of Proton's servers. This is extremely sad, as even the most trivial features of other VPN clients are missing, such as Wireguard. Another major problem with the client is that there are not profiles of any kind, the kind which can be found on all the other Proton VPN clients. Proton should get some of their developers to fix up/rewrite the app to get it on par with the other clients.