Games that restrict you to ONE SAVE...why is this a thing?

[Jizz_Beard_thePirate]

I used to think it was due to save file size restrictions cause some games had save files that were pretty big but idk anymore. Wonky design choice would be my guess! Although, I do suppose that now a days, we do have different "profiles" that have saves based on profiles/accounts soo maybe thats why they are doing it