1. Long-term, you accumulate more BTC
That's only a speculation, no fact -- your gear may die or become unprofitable to run long before you accumulate the BTC or the equivalent of what you bought it for.
2. Daily cash flow instead of stagnant holding
BTC is too liquid; it makes this argument wrong. If you bought BTC for the same amount of cash you spent on the gear , you can sell BTC daily and have the cash flow you want.
3. Greater flexibility when selling your BTC
How?
4. Purchase of real, tangible assets
Irrelevant, your mining gear is directly related to
BTC, if
BTC falls, your gear drops with it, a very weak point.
5. Combined value of machines and cash flow
Same points you mentioned earlier
6. Tax benefits from purchase and operation
Limited to certain countries, doesn't apply for me.
7. Connection with experienced miners and OGs
Useless.
8. Resale of machines at a good price
Assumption.
9. Opportunities for profitable strategies
How?
10. Limited options if you only hold BTC
Not worse than owning mining gear.
This topic gets discussed endlessly here, with everyone having their own take. Personally, based on my own experience, nothing beats buying and holding BTC, especially if you dollar-cost average your way in and out slowly.