Possibly getting more dust, specially if you have bottom intake fans. I'm using an Akoada CPU Stand for PC Computer Case Holder Bracket Desktop Mainframe Rack with Brake with 4 Caster Wheels(Black) which costs about 16 quid.
Not a great looking piece but helped few cases which where quite close to the floor, affecting the bottom intake performance. Not an issue with the O11 XL or the O11 Evo I'm using now, but I still use it as is handy to move the case around and being slightly over floor level, helps a bit regarding dust on the bottom filter.
Main benefit is less intrusive noise from bottom fans.
To be fair, would take a very dusty environment to actually be an issue. Good filters will do their work, every now and then, just clean them to keep performance.