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I bought a set of mugs like that recently. It’s a shame because they are pretty nice looking, and comfortable to hold when empty. But when full of hot liquid, the handle just is totally inadequate.
They are from IKEA, so at least they didn’t cost too much, but I am a little surprised because their stuff is generally pretty well thought out from an ergonomics and usability perspective–it’s only really the sturdiness/durability I ever worry about.
The best mugs I have are still a pair of the stereotypical featureless cylinder type I got from a giveaway 10 or 15 years ago–they are utterly boring, but the handle fits 3 fingers for a perfectly stable grip!
Given your instance, I’m guessing you’re not from the US… but here there are two generally standard shapes for residential toilets–round and oblong. The round ones fit better in small bathrooms, but man when you are used to the oblong shape it feels like sitting on a child-size toilet or something.