I don't think it's a problem if someone invests in Bitcoin using their savings. Savings are essentially the money left over from the money we've already used for our needs. Therefore, savings can be considered discretionary funds, but the difference is that they've been accumulated well in advance. So, don't assume savings aren't discretionary funds; in my opinion, they are. Therefore, it's actually a good idea to convert savings into Bitcoin, as this will certainly protect them from inflation and will undoubtedly increase in value. So, the point is, don't confuse anyone with your assumptions, because you might be misunderstanding this too. Money for necessities and money for savings are two different types of funds.
I disagree with you dude, only discretionary should be use to invest in Bitcoin and in case you have forgotten, when we made mention of savings it comprises of discretionary, emergency, backup funds etc and so you should specified what saving because emergency funds and backup funds can not be used to invest or accumulate Bitcoin else you will suffer it in time coming. So please don't make newbie here believe we can use our saving to invest in Bitcoin because that is not true, only discretionary income should be used to accumulate Bitcoin.
I don't know why the both of you are complicating things for yourselves. But let me try and explain this as simple as I can so you guys can get something right. When an investor get his salary and he removes all the money for family necessities, what he have left is called discretionary income. From that discretionary income he can remove a portion of it to build his emergency funds and his reserved funds. Then he can invest the rest in bitcoin. As times goes on, if the investor sees an opportunity in the market and his salary hasn't come and he doesn't want to miss such an opportunity, he can take money from his reserved funds account to invest in bitcoin and build it back gradually. So yes an investor can buy bitcoin with money from his reserved funds account.