The thing is that, additional emojis and mere symbols like these are technically much easier to add than under-digitized languages which require much more resea

The thing is that, additional emojis and mere symbols like these are technically much easier to add than under-digitized languages which require much more research. (The initial introduction of emojis wasn't easy, let me clarify.) These characters are just another entry to the code chart and Unicode character database without any additional mechanism to fit. So it should be okay as long as there are not too many characters added in this way. Reply to EDIT: People who made the proposals are already well known in Unicode and they know what they are proposing. Michael Everson for example is responsible for encoding many other writing systems other than such symbols.