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Both of you make sense but I don't want to side.
First, Physical world and Virtual world is different in a way. Let me give you an example.
A 0.00001 Cookie is basically nothing, you wouldn't even be able to tell or see it unless you use a microscope. It won't even be enough to be considered a food for a body but A 0.00001 of Bitcoin might be enough to buy you a house in the future because the use of cookie is to be food and there's a minimum amount that we should consider before it is even considered as such. One molecule of Cavier is the same, it is food.
Bitcoin's use is to transact which as of now, 0.00001 is alright to do that.
Let's set aside value for now and discuss the use of Bitcoin. Technically, 0.0001 Bitcoin have the same purpose as 1 Bitcoin. You can send, receive, sign, and pretty much do everything with it without having to compromise its real purpose. Now let's talk about cookie and cavier. 0.0001 of them won't have the nutritional value or satisfaction of eating it compared to a whole which defeats the purpose of it being food. You see now? Different things have different use and different limitations. Though we can't say that we can use 0.0000000000001 BTC because that is super absurd.
Let me explain even further.
In Khaos77 argument, there's truth to that but there's a limit. 1 Bitcoin now might have the same price as 0.001 Bitcoin in the future but that doesn't mean we could move decimals so much because let us consider the technicalities of Bitcoin. Sending too little will be considered a dust for example. Dust is a miniscule amount of Bitcoin that miners won't even consider taking which results into transfer not getting confirmed, unless you use LN or built your own mining farm for that purpose which is unrealistic for now (maybe in the future when Bitcoin is $1,000,000,000?) then we have to consider the mining fees and such.
Though we can move denominator in the future due to price influx, moving it too much will have some problems. But let's be open and consider the future.
We have to consider that Bitcoin's price is getting higher. I don't know, maybe in the future we start using Satoshi instead of Bitcoin because of price? Only time will tell. Bitcoin can change.