Having 3 units of full-size USB 2.0 port or 3 units of full-size USB 3.0 port

Having 3 units of full-size USB 2.0 port  or  3 units of full-size USB 3.0 port in a  15.6 inches Linux OS   Laptop/Tablet/Smartphone   hybrid(tablet)  is very
useful .  The  first full-size USB port of the 15.6 inches  Linux OS   Laptop/Tablet/Smartphone   hybrid(tablet)  can be use to connect to a  USB scanner .  The second full-size USB port  of  the  15.6 inches  Linux  OS   Laptop/Tablet/Smartphone  hybrid(tablet)   can be use to connect to a flash drive or a thumb drive or a external hard disk drive .  The third full-size USB port  of  the 15.6 inches Linux  OS   Laptop/Tablet/Smartphone   hybrid(tablet)  can be use  to connect to a  USB Docking Station  so that we can have more USB ports  and in turn connect to various peripheral devices so that we can UTILIZE THE FULL POTENTIAL  of  the   15.6 inches  Linux  Laptop/Tablet/Smartphone   hybrid(tablet)  just like a  PC .  Having 3 units of full-size  USB 2.0 port  or  3 units of full-size  USB 3.0 port is also very useful because , firstly , we can use all these 3 ports simultaneously for cloning hard disk drive   and  
secondly ,  we can use all these 3 ports simultaneously to install other operating systems (e.g.  another version of Linux OS) .