For younger guys it maybe important to walk away for good, this is because you are in a situation where your percieved (or agreed) smv is below hers. Basically this friendzone situation is where your interaction with her are on the assumption that your smv is below hers.
Being able to walk away for good is important if you are in that situation.
For more experienced men, you never enter or remain in the situation where your percieved or assumed smv is lower than the womans.
I approached a 5'11 blonde 9 and got her IL super high. Now have her number and she is being nice. I approached her directly after her IL level was raised up. Chick was working on a drinks stall next to me. Went to get drink and had an interaction, nothing much as I didnt notice her just went a got a drink. Next day went to get another drink still not noticing the chick just thinking of the drink, have some more banter and exchange, 5th day went back and got another drink, this time something weird happens in our banter and there is a subtle connection. Next day I notice her looking at me intently but I pretend not to notice, now she really likes me. I go over to her stall and she gets nervous and asks if I want a hotchocolate, I said No I just came to say Hi, we make some quick talk for 3mins but were both a bit nervous. I continue the interactions for a few days (delaying, buying time, games, whatever) before getting the number. The job ends soon after and now I have her number and maybe organise a date.
But I only moved after I saw that she was more interested in me and was kinda getting in feelings. Going over to her validates her interest in me, whereas if I had made a move on 1st or 2nd interaction without seeing interest from her, it would create the idea that my smv is lower than hers.