[raxxorrax]

I think the lacking hyphenation is the main problem for web content, since it creates large empty spaces in conjunction with justified text.

But having hyphenation would mean that browsers would need to have an extended dictionary for all languages.

For reading I actually prefer it when done right, but that is subjective, I never stopped the time.

[WorldMaker]

Browsers already maintain hyphenation dictionaries (and/or know how to ask host OSes for them), it's just that because hyphenation and justification are two different knobs in CSS a lot of sites turn on one without the other.

Browsers also support some of the same tricks that designer tools support to encourage/support hyphenation such as supporting soft hyphens (https://en.wikipedia.org/wiki/Soft_hyphen). But those tools are something that require training and/or forethought and not something that average web content would likely include.