Those who want to invest, of course, will not want it to remain constant. Even if it is falling, the fact that it is moving keeps the market energetic and there is a constant flow of money in the market. As the value of Bitcoin increases, the number of people who want to invest will also increase. Therefore, more money will be involved in the market. Obviously, the constant value of bitcoin will not make anyone happy.
They will want Bitcoin to be stable in price if they hate Bitcoin and hate Bitcoin investors so they don't want to see other harvest good profit from Bitcoin increases.
Or they are Bitcoin investors and want Bitcoin to be stable in low prices in order to have enough time to accumulate as many cheap bitcoins as possible.
They should not invest in Bitcoin if they want its price to be stable. If they want a stable thing, they can hold their money in fiat currency, not stable coin.
I like the volatility of the bitcoin price as it is now, if the bitcoin price is stable then it's no longer attractive and fortunately the bitcoin price will never be stable because bitcoin will forever continue to be a decentralized coin/asset.
in the market there are many stable coins/assets that already have many users then bitcoins no longer need to be stable coins/assets.
Bitcoin as a free market, it has volatility that is sometimes high and sometimes low or stable. High or low volatility, you should pay attention on trading volume that is shown how much capital is in the market actively.
With low trading volume, price can not rise higher but if you see high trading volume, you should do more research on whether big exchanges do some promo for trading like waiving trading fees, bonus with high trading volume profiles.