TcNo-Acc-Switcher VS Playnite

This is what I use: https://github.com/TcNobo/TcNo-Acc-Switcher

Your observation is right. From own experience, Valve does closely monitor IP addresses on login. When anything seems fishy, Steam invalidates your saved credentials when you start it. Which requires you to type in your password and Steam Guard code again. This even happens if you use two Steam accounts on the same PC without special preparation (like not using an account switcher tool)

not really useful w/o "remember 2fa" feature, similar to this

If you want to take extra precaution then create a throwaway email and steam account. Switch between accounts with TcNo.

Use a throwaway email to create throwaway Epic accounts, and no worries. Then switch between accounts with TcNo.

Yep, check this out

Here’s the GitHub GitHub

This program can do it. https://github.com/TcNobo/TcNo-Acc-Switcher/releases/latest

[ Source code - see: TcNo-Acc-Switcher-Server ]

I've done something similar before with Playnite (an open-source PC game library manager), which has an HLTB plugin.

Playnite: The one with the most features and libraries available via addons and has a lot of options for customization. In my opinion the best one available for this purpose.

Here's a project for Playnite 11: https://github.com/JosefNemec/Playnite/milestone/9

As for my LGO, the only other app I've installed outside of the standard launcher was Playnite to consolidate all games into one place as Legion Space doesn't detect everything I have installed and I don't want to manage manually adding games to their launcher.

use playnite instead of the individual launchers.

Here is where I come in and recommend everyone check out Playnite: https://playnite.link/

When I care about supporting a developer or publisher and they offer their product on their own storefront DRM-free, I will often go there to buy. Or I buy from GoG which takes a smaller cut. Playnite lets me launch my Steam and non-Steam games in a seamless fashion. Steam still does a great job as a game installer/patch manager, and helps me discover new games. But I'm not locked into paying them a 30% fee, which is pretty brutal for some smaller publishers.

Game Launcher https://playnite.link/

For anyone with any of the myriad of HDR monitors that prefers to leave desktop mode in SDR RGB, I just discovered that the excellent Playnite game launcher has a feature where you can enable HDR on a per-game basis. Simply tick the "Enable HDR support" option under "Advanced" tab for the settings of the games that you want HDR turned on for. I was previously using the now-abandoned AutoActions for this, so glad to see there's an alternative in a tool I already use.

Not exactly what you are looking for, but I've been using Playnite to launch everything on my computer for years.