Why is the options API deprecated?

[telion2]

I just noticed this alert in my browser:
[intlify] Legacy API mode has been deprecated in v11. Use Composition API mode instead.
About how to use the Composition API mode, see https://vue-i18n.intlify.dev/guide/advanced/composition.html

Not sure what you exactly mean with Legacy API, but if you mean that the Options API of Vue is deprecated, then I do not see a trace of that in the docs:
https://vuejs.org/guide/introduction.html#api-styles

=> Do you really mean that the options API is deprecated in i18n?
==> if that is the case: Why? I like using the option API and don't like to use the composition API.
I like using i18n in the options API version for 2 reasons:

• I am used to it and I know what I am doing
• Switching to composition API forces me and my team to partly relearn Vue and development is slowed down
• The Composition Variant is a lot more verbose than the options API. (I just use [this.]$t("...") and it works)