M.2 ssd in a PC really makes any sense?

Question

Iron

I noticed that the fashion for M.2 SSD drives in computers has gone. M.2.
After all, as I understand it, there is no good cooling for these drives, which should be solved in 3 ways:
1. by creating more energy-efficient M.2 SSDs, which will negatively affect the price.
2. stupefying the controller and other things like that
3. and hammering on the longevity of the disk. Like it will die from overheating - it’s better for us, they’ll buy a new one, there will be sales.
In any case, no M.2 SSD needed! (in 99% of cases, if we talk about the PC).
So why buy them? And/or why motherboard manufacturers make M.2 in motherboards.

Answer 1

Well, firstly, M.2 is a physical interface, or if humanly speaking - a connector, a connector, a crap where the board is stuck.
In M.2, you can connect anything, not just drives. It just assumes a compact single-board device.
If we talk about disks, SATA disks and PCI-E disks are plugged into the M2.
SATA drives - well, ordinary sata drives, with all the limitations of this interface, just in a different form factor. Sometimes it's convenient.
PCI-E drives are already another faster interface, the transfer speeds are higher there, and, unlike SATA, they can reach 2-3 gigabits per second.
Heating depends on the controller and the load - if the controller is powerful enough and a large load will heat up.
Cooling in such a miniature form factor is not very good - so the controller will simply reset the frequency for cooling - quite normal for home purposes.
If for a server - they take boards for a normal full-size PCI-E slot.
What's the point of marketing is unclear - you just buy a disk with the most convenient interface.
Here, for example, I have a samsung plugged into m2, firstly, all sata ports are occupied, I have only eight of them, and secondly, the speeds there are clearly less. But it gets warm.
Optan tried - it heats up much less, but there the controller is understandably stupid, there is nothing to warm up, but the price tag still bites.