I can only conclude they want to keep their non-KYC business as long as possible.
I fully agree with you, although they have more offerings regarding coins than other exchanges (and other services), I'm sure that a vast majority of its users joined Binance due to their big - at least when compared to other exchanges - non-KYC withdraw limit. Most of them don't even allow you to withdraw your fiat at all if you didn't went through their KYC procedures(see Bitvavo[1], Kraken[2], Coinbase[3] for example) - one can't simply look into this factor and don't see that Binance has a vantage point when compared to other exchanges - one can easly see the 24h volume of each in websites such as coinmarketcap[4] or Statista[5].
My take ? As I said, at the time of their announcement that they would lower the BTC withdraw limits Binance was on the eyesight of major regulators and they wanted to please them in any way possible to reduce the "heat". The solution? Just give what they wanted to hear - "lower" the limits. This generated tons of news around the internet and for sure the regulators were satisfied with this step, but I also think that Binance threw a bit of sand into the regulators eyes with this measure - I would say that they for sure don't want to rush at all this transition (let alone for their big clients) - so they kinda "announced" it but they don't want to comply 100 % with it for as long as they can (or as long as regulators remember their announcement and don't remember to check back on their promise ...).