No matter how many bitcoin you hold you can still misuse the money, so we should understand the concept of Richness and Wealth.
The amount of Bitcoin you save won't change but the value of those Bitcoin does. By holding Bitcoin especially in next few years, the value would increase like in past several years thus people always have been saying that holding Bitcoin is beneficial because you can get profit from there (hence holding and invest on Bitcoin is interchangeable).
Unlike fiat the value of that fiat is decreased because of inflation, so your post doesn't make any sense here.
Savings in bitcoin is different than when you save money in your bank. When money is being saved in the bank it loses value but when bitcoin is save it increase in value. I think hodling Bitcoin is not a bad idea because it will always add more value. Bitcoin is considered as investment when people hodl it because of the value it adds. I don't think it is bad when people save bitcoin, bitcoin is different from other currencies when it is being saved.
Owning Bitcoin is not categorized as savings, but it is an investment, we must be able to differentiate between them.
Saving means saving money without any risk unless inflation occurs in the far future, while investment is something that makes everything possible.
If we talk about whether it's good or not, of course it's much better to invest, so it's said that just saving won't make you rich, it's different from investing.