So let's say BTC was to be absolutely frozen from here on at todays price ,would you still buy?
I don't think BTC was intended as the speculation tool it has turned into .
Who on here regularly makes purchases using BTC ?
It depends. If only the price is frozen, but lending, staking and DeFi still exist, yes, I will buy it to make more money.
There are many other ways to gain value besides the dollar crypto price.
Yes, the Defi thing is really the most important thing for me in buying bitcoin due to freedom of finance.
Also this is one of the best features of bitcoin, the government doesn't have any control on your money, they don't have any regulations on your crypto assets.
With that situation, you can still make bitcoin profitable not only about its price in the market. There are a lot of things which can make you multiply your bitcoin investment, like what @Dutchyyy said. There are a lot of options for you to make this investment still valuable and progressive not only waiting for its price to increase.