Now the big major companies these days like TESLA for example are making big transactions with bitcoin making btc look viable and acceptable for exchange even in the future and we all know that this is only possible because they find it more easy and secure for their digital transactions with low transaction fee compared to the normal bank transaction system.
It could be cheaper, but you're talking about big companies, while your imagination is any company scale must accept Bitcoin because its easy, secure and low fee. This is wrong because if you send small amount of Bitcoin, you need to pay fee, while using debit card or cash will not charge any fee.
Bitcoin could be accepted by many companies, but it's not a good choice to be used for regular/daily transaction. Why I need to spend more fee when I have a free option?