How much cash should I take with me when I travel to Europe?

It is recommended to calculate 80-90 Euros per person per day. For example, if you go to 10 day, it is best to bring about 800-900 euros in cash. Of course, I think it doesn't matter if you are less. I just came back from Europe ten days ago. I heard that sometimes the Immigration Bureau will check the amount of cash on you and calculate it according to 80-90 euros per person per day. In order to prevent you from being hacked in the local area, he thinks it is impossible for you to bring too little cash when you travel. I went for two weeks and spent less than 600 euros in cash. VISA or MasterCard credit cards can be used in most places, and even UnionPay cards and Alipay can be used in many places. In addition, there are many thieves in Europe, and the hotel staff said that robberies often occur. It is not recommended that you bring too much cash. I think that according to 10 days, it should bring about 500-600 euros to everyone.