From Nation Cymru:
We hear a lot about why Welsh should move aside and allow English to take over. But why should it? The Welsh language is vastly superior to English, as we will now demonstrate! And, in fact, we think the English would be much better off cognitively, financially and intellectually if they cast off the yoke of their own dismal tongue and embraced the ancient Celtic language of Britain.
1.) English doesn’t have enough vowels