There's plenty of people for whom handling a PC is difficult. E.g. various popups (windows update, antivirus, microsoft nagging about microsoft account, printer nagging, "disk almost full" nagging, OneDrive file sync nagging etc.) alone are too much for my Mom, whereas she's handling her iPad (for example) just fine. Also, there are issues specific to gaming on PC - every time there's a technical issue with a game (which in itself is never a thing on consoles), the forum recommend installing different version of the video driver. It may or may not work, but it leaves you with an evening of technical troubleshooting instead of gaming.

Not to mention that games on Steam do break, esp. older ones which are no longer actively maintained [1]. I haven't heard of such fails on consoles, probably because they're a much more stable platform.

[1] E.g. Steam's Civ 5 has been breaking for a couple years now, going into low-res video settings and refusing to bring them back up. Why? Who knows! The only thing that seems to work is using "repair files" option in Steam every time that happens.