Promotes nonstandard IE functionality then complains about having to support it all
tl;dr - MS employee grumbles about still having to support obsolete, nonstandard IE functionality that people were still using when it was MS that had abused their market position to lock users into those nonstandardisms in the first place.
Reminds me of a few years back when some MS engineer was whining about having to continue supporting lots of archaic nonstandard cruft in newer versions of Internet Explorer because people still had the temerity to be using systems that required it and hadn't been updated.
Yeah, that'd be the same nonstandard shite your company introduced to IE from the late 90s until the mid-2000s when it was abusing its dominant market position to kill off competition and didn't give a toss about web standards. Quite the opposite, it was quite happy to embrace, extend and extinguish when it suited *them* to lock everyone into IE and its non-standardisms.
And they got what they wanted, everyone used IE, plenty of stuff was written that required it- and assumed everyone used IE anyway- and this was entrenched for years until Firefox came along and finally broke its monopoly.
Most big websites had the resources- and motivation- to spend on redesigning their sites, but plenty of smaller systems didn't (*) and that's why IE required fallback and stupid compatibility hacks for older websites (**) for years on end after MS started- slowly- moving towards universally-accepted web standards.
So now MS were whining that people were still using the functionality *they'd* locked them into- and *wanted* to lock them into- requiring?!
Expecting sympathy for that was the height of hypocrisy.
(*) Even today as MS are trying to kill off IE, I'm *still* supporting a system from the mid-2000s that was written (not by myself) on the assumption it would be running under IE. Some bits have been rewritten so that it's usable under Chrome, Firefox et al, but not always as conveniently.
(**) Even Edge contains an IE compatibility fallback mode which- in conjunction with the existing IE fallback behavour- mostly works with the system I mentioned above. But there's still one issue with a printer that can't be fixed because that aspect of "IE" can't be configured within Edge.