Do not promise that you will not buy bitkoyn in cash. Still everything can change and your opinion on this matter as well. Why do I have a non-functional bitcoin? It will soon be used as a container of value, not as a means of payment, since the transaction time is too long, and the commission costs are decent. Is it not better to use those coins that do not have such problems? There remains the difference in price. However, it is also very volatile.
It is, but remember no other coin has Bitcoin traffic, though Ethereum might be close. And as far as BCH 8mb blocks goes, if the blocks were always full, it would cost you several terabytes of network bandwidth per month to run a full node not to mention huge storage requirements as well as increased computational requirements as bigger blocks requires more CPU to be verified. In other words, running the full node would be prohibitively expensive for a regular user. This is a security issue for regular users as running a full node is always more secure than using light wallets and SPV (with SPV you have to trust the server you're connecting to some degree) as it is a security issue for entire network as smaller the number of full nodes is the less decentralized network. Also, it's worth pointing out that system that gets too demanding to run under the full load doesn't scale well. So block size increase does not solve scalability issue.
theres no one pushes you to buy bitcoin cash,about us even if we buy and fails do you care?coz me i dont care about your sentiments what matters for me is to gain profits in trading whatever coins might come that can offer me earning i will grab it without your consent
That might be true, but there are other people, myself included, who cares much more about stuff such as decentralization or technological innovation than they care about investment profits. And from both of these points of view, BCH is trash. Also, there are other coins, that might have better ROI in medium time frame than BCH.
I suggest reading a bit about BCH code, the blocks get compressed before proliferation. It's scalable that way just fine.
Unlike lightning network.