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Is it possible to install previous macOS version on newest macbook model? I see people having terrible experience with macOS Tahoe yet I am considering purchasing a macbook..

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On M5 MacBook Pro: no, simply because no builds with drivers for it exist

On all others, including the M4 MacBook Air and the M4 Pro/Max MacBook Pro currently for sale: yes. At most you'll have to make a bootable USB if it's already got Tahoe installed, you can even install in place (but some things might break, of course)

no this is not possible because apple stops signing older versions soon after they release the latest.

No, that's a separate issue. You can upgrade a M4 or earlier machine from 15.6 to 15.7 even today, despite 26.0 being out for a while, so Apple's still signing a 15.x release at the same time as they're offering 26.x releases. (You likely won't be able to downgrade from 15.7 back to 15.6.)

Downgrading a M5 machine to 15.x would be impossible not because of a signing issue but because Apple never released a 15.x build that supported M5 hardware.

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