Why is HTTP/2 support disabled by default?

[anewuser]

Hello. I was getting errors like this in the log while trying to import hearthis.at feeds:

type="critical" -> core: Cannot fetch medatada for feed: 'https://hearthis.at/desire-cs/podcast/' with error: 'access to content was denied'.

I had to enable support for HTTP/2 in the settings for them to work. Most casual users wouldn't be able to figure this out by themselves.

Why does the client disable it by default?