Planning on buying a whole Bitcoin is not wrong especially if you have the capacity after all institutions and companies are buying based on their reach but it will be very wrong to think of buying a whole Bitcoin when you don't have the capacity because you will be discourage at some point rather what someone should do if they don't have the capacity is to be accumulating little by little using the DCA method and with consistent buying and using a good amount you will see yourself holding more than 1 Bitcoin in years coming because you will also be taking advantage of the Dip sometimes.
I think you are you are missing a key part of the bigger picture, Satoshi might not have priced of Bitcoin at $100k sure but the whole idea was to create a decentralized system were value can be stored and transferred , no matter the price point. the fact that people used to buy whole BTC for a few dollars does not change the design it should shows how early they were. but today buying bits of BTC does not mean it is wrong or against Satoshi intent. value grows and access adjust that's part of the Bitcoin's journey.
Not everyone has the same financial situation. In this case, it is not possible for everyone to have a whole Bitcoin. In that case, an investor can adopt a gradual purchase strategy in the DCA method so that they can continue to invest regularly according to their ability. Bitcoin is basically a system that is decentralized, secure and allows for individual freedom. Here, it is not a big deal whether someone has 1 Bitcoin. The most important thing is how effectively someone is using it. I think that whether I own a full or partial Bitcoin is not the main thing. If I invest in Bitcoin regularly with patience according to my financial ability and can use it with an understanding of the purpose behind this technology, then I will be considered a successful Bitcoin user. Over time, it will not only benefit me but also give me the opportunity to be a part of an independent decentralized financial system. When we think about Bitcoin, we will not only consider its price but also its purpose and our ability. There is no obligation that you have to buy the whole one Bitcoin and it is not possible for everyone. The path to success in tech is to patiently invest in long-term steps. At the same time, the real power of this technology is to create decentralized economic opportunities for everyone.