In core rules, wizards can't scribe outside their class, so it's the same for them (in terms of 'can I use this spell scroll') as for anyone else. The complaint is that, unless you meticulously memorise each class's individual spell list (because even wizard and sorcerer differ in 5e), you still have to take time out to look it up, if you're trying to play by the rules - which is time out of the game space that one shouldn't really have to be taking, in an ideal situation, and which one wouldn't have to if the rules had been placed into the game properly.
The good news is that this is most likely going to be fixed (everyone casting and wizards omni-scribing) with the major magic and casting update that is confirmed to be happening at some unspecified point in the future. This is something that they are aware of and are (at last comment, subject to change) intending to bring into line with formal 5e.
