Its better to have this kind of warning on where they remind people to deposit or withdraw their funds on their preferred network. Since with this for sure that they can save lots of money also time if they have reminder on things that they need to do.
It was not common in the past with less blockchains than now. With abundant blockchains for stable coins recent years, centralized exchanges and many online platforms develop automatic detection tool on which blockchain an address pasted by a user belongs to. This reduce risk of choosing wrong blockchain by users and it can help reducing support requests on customer staffs as well.
For sure this issue might gonna happen again to other people especially for those who didn't check well the network they are sending.
For experienced users, they are knowledgeable and experienced enough to have no problems with it and if they made mistakes, it is only by their carelessness or device hacks.
For newbies, they even don't know all these basic things and this feature is very helpful for them. Remind them to pay more attention on what they are doing and do enough careful checks.