Even if you can get stocks with bitcoin payment that is not really the ideal situation because bitcoin is volatile whereas stocks are not as volatile as bitcoin. So, the money you are sending could be worth 100 dollars right now but could worth 110 or 90 in an hour and thats a risk those companies are not really willing to take. What makes a difference is the stablecoins, with stablecoins you could probably get more of a value out of stock exchanges.
Of course, for that to happen first we need to figure out how to convince those new hip startup stock exchange apps or websites to take a look at stablecoins, but if we can manage that believe me they will be going for it by the bunch because if one of them does it and get users the other ones will want to get it too.
indeed it seems possible brokers should also think of accepting payments for the purchase of shares using bitcoin. we must acknowledge that changes in the price of bitcoin are running per second and cannot be predicted. of course there will be risks that can be beneficial but can also be detrimental because of the instability. it seems to make a purchase of shares they can be sure they are more happy by exchanging it to fiat first and then making a transaction. besides maybe brokers are also crypto activists and being able to analyze the matter of bitcoin is certainly not a problem, but is there anyone who can, I also don't know.