I had a Dyson and it lost suction in no time and needed the filter cleaning to get the full suction back. If it doesnt have a filter then dust will go straight into the motor

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Well no, not with the Dyson I had. I'd press the button and the compacted dust would stay in the dust collection thing, so i'd have to remove the cylinder from the centre and tap it on the side of the bin to get it all off. All the while breathing in all the dust floating around as i'm messing about.
Maybe they have improved over time as this was 8 years ago. I was just giving my experience with them.