It's not bashing Windows Defender, it's pointing out facts, as Lockdown mentioned.
I strongly believe, feel free to disagree, Microsoft should focus on stability and bug resolving on Defender before adding more modules such as "sandbox".. Once you've got a stable product with the most reduced ammount of bugs, start developing anti-executable techniques and modules, like the block at first sight function. If they can deal with Application Control modules and similar instead of signatures, I'm pretty sure Windows Defender would be much more efficient.
I just find it amusing how they can't make it stable or at least more usable, being the devs for the OS it's default installed in. Anyways, after 1809 it doesn't suprise me.