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(1). You don't have to hold Bitcoin forever, it is still a form of money, plan on spending it someday, you don't have infinite life.
Technically, this is true to a certain extent as it depends on the investor on how they view BTC.
If you have various investments on your portfolio, then you may utilize them according to the purpose to which you designate.
(2). Don't go extra miles working yourself to death to accumulate BTC, BTC will remain but your health will degrade.
This also applies to work, in general that nothing is richer than life itself. There will be opportunities for a person to earn money, but if you neglect your health, then this will cost you more in the future.
(3). It is not a must to leave BTC for your offsprings, you have learned alot, the knowledge you've acquired is enough to be passed unto them.
Again, this also applies to any other investments. The good thing is that you can plan on how you could necessarily pass your investments to your heirs. The limitation here would be the technicalities of cryptocurrencies regarding its accessibility.
(4). BTC have a bright future, but we don't know if it will retain the shining light after several years have pass.
BTC is deflationary- its value increases the more its supply decreases. Given that there is only a limited amount of BTC which are yet to be mined, expect its price to increase in the future, without any prejudice to other factors affecting its price.
(5). All what you worked for (BTC accumulated) can still go to waste even if you leave your private key for your family, what took you years to gathered can be squandered in a month.
Again, this will depend on how you would approach it. As a general rule, you should leave your BTCs to someone who can be trusted and who is at least knowledgeable on this field. If they are not familiar with the concept of cryptocurrencies, then what you mentioned may happen.
(6). BTC miners plays a major role in the life of BTC, value and security wise.
The existence of miners give birth to the supply of BTC. Think of it as gold or diamonds. Without these mining companies, these precious metals will forever be not unearthed, therefore not utilized.
(7). No crypto exchange is more BTC friendly than your private non-custodial open source wallet.
I agree with this. Exchanges, on general, provide convenience for the transaction of your BTCs. Unfortunately, exchanges have been scammed in the past.
