Samsung 970 PRO and EVO NVMe SSD M.2 SSD information

Hey, anyone alive here?

Guys, I need advice, regarding over-provisioning. I've bought 970 Evo plus recently, for 1TB. OP is 10%, which is almost 100GB!
So, I know about OP, TRIM, perfomance, endurance, nand cell's replacements, etc.. But, I'm really lost regarding all this in real life, i.e. how it actually looks in "home" kind of usage.

Thus, I would like to keep some volume for myself - and since I've considered 1TB as totally needed... Simply put, I don't know how much OP space to leave.
As an example, for 1,5 years of active usage, I've wrote ~18TB of data on previous system SSD. I thought about calculating probable wearing level, but something tells me it's just stupid and won't give me any hint.

You do not need over provisioning with TRIM supported by the OS.

What about cell replacement buffer? On vnand tlc?

If you don't fill the SSD, the free space is the buffer. And in that case, since you would fill it without the OP, you would not have enough space for OP anyway.

Well, thats no more relevant any more, since I've tried changing OP in magician....so, I thought it would give me smth like 1024GB available if I disable it manually, so it reported "10% is allocated for OP, total size is 930GB" But turned out, 930 is full capacity no matter what's OP size is. Furhtermore, despite being reported as 10%, IRL it looks like OP is set to 0% by samsung - cause setting 1% OP manually gives you 921 GB of usefull space.

Holy cow they are expensive. I'll wait for the new tech tax to wear off, and get a HP ex920 for now, and an "old" sata3 1TB SSD for games only.