I think it's a fair statement, given that the Beatles were together for 10 years and all 4 became prominent musicians in their own rights afterward. McCartney & Starr have been solo artists for almost 4x longer than the Beatles were together!
Comparing the two bands is hard and probably unfair. The Beatles were first, so they get the benefits and detriments of that. The Who lasted longer, so they get the benefits and detriments of that.
For me there is no contest - I rate Townshend as the greatest songwriter bar none, but like he says in the quote, he took a while to mature. Hell, even Lennon made fun of McCartney's songs.