Experienced people will never buy Bitcoin when the price is rising, they tend to wait for the price to drop and then buy and store it for a certain time to take big profits later. Therefore, in investing in Bitcoin, never FUD and FOMO and must be able to manage emotions so as not to get caught in big losses.
I don't think you are right because experienced investors who understands the concept of bitcoin knows that Bitcoin is a long-term investment as such no one knows what the price will be the next minute thats why they utilize every opportunity to buy at all time, so price upsurge wouldn't be a hindrance for them not to buy Bitcoin anytime anyday because of their set goals and plans, talking about loss in bitcoin investment it seems you don't understand it, you can only lose your Bitcoin once you forget, misplace, when a third part get in contact with your seed phrase or when your wallet gets hacked and also when you involve yourself in gambling activities or trading but as for losing or incuring loss in Bitcoin investment it is not possible, I think you are trying you referring depreciation to loss which both are not rhe same, your Bitcoin holdings can depreciate as a result of the decrease in price which will also appreciate once there is an upsurge in Bitcoin price, though seeing your investment depreciating is not an easy stuff to bear as an investor but long-term mindset and volatility should keep you on the lane that the price of Bitcoin is not permanent, it changes from time to time and that should be a hope reassured.
I agree with what you've said @Promocodeudo and I want to add to your statement that investor can't totally lose their holdings cause volatility must occur which is price drop and increase and that's what many investors don't understand, they think that once they invest and price drops, they could end up losing some portion of their holdings not knowing that once the DCA is implemented you'll lose no doubt but would still recover your lose so far the investor is persistent in investing. That's why it is advised that an investor should have a stable source of income to be able to invest continuously since they're using the DCA method, I think most of those investors who doubt the DCA and think waiting for a dip to occur before investing should try using the method and see for themselves whether it's good or not before concluding, just that most of the people in such category are not patient enough to invest for long-term, their aim is just to wait for the dip invest and take profit which is never the concept of Bitcoin investment. To be a successful Bitcoin investor, apart from being disciplined, one other key trait an investors should have is patience and many investors lack that.