Ever since 1.13.1, obfuscated text (§k if you're more familiar than that) uses characters from GNU Unifont as well as those from the standard Minecraft font. Not only do I personally think this looks worse, it also eats up loads of RAM since every single character ends up cached, hurting performance. (https://bugs.mojang.com/browse/MC-277733) If only the characters from the actual Minecraft font were displayed in obfuscated text, this would considerably improve how obfuscated text both looks and runs.
Attached image shows how obfuscated text looks in different version ranges. The 1.7-1.12.2 look is what we're after - it includes all the accented and non-Latin characters that Minecraft defines textures for, while excluding everything that uses the fallback font.