It probably isn't. But as their business depends on software, it's worrisome that rather than understanding what was wrong, they just switched software. That doesn't seem inspiring to me.

Nobody said they had to fix the problems, but identifying them, and checking if they were fixed upstream seems like a good idea. Sometimes upgrading is a nightmare and doesn't fix anything, sometimes it fixes a major issue and drops cpu usage from 90% to 5%. If you know what the problem areas are, it should take less than a day to look at the changes and see if that area was addressed. Even if not, reading the changelogs and version notes should give some idea. It's fine if they didn't test upgrading, but again, I'm not inspired about their engineering talent and processes when it looks like they didn't even look to see if it would have been likely too help.