Not always high, if you check at mempool, sometimes it under 10sat/vb and the same between low, medium and high priority, unless you send BTC from an exchange where the WD fee doesn't decrease. But still with adding other cryptos as an option, players can choose which crypto is really cheap in tx fee also what crypto they have.
But, if you choose such periods when the mempool is small, you will have to constantly or periodically monitor this. It generally takes both time and attention, even if you just put indicators. And then you need to go to the site and make a transaction. All this is terribly inconvenient, especially if you are doing your main job. So, of course, it is much more convenient to be able to pay with altcoin, and when the commissions are small at any time.
I wish the devs did it as soon as possible.