Do you mean rolling random encounters while traveling or Rolling encounters randomly within a dungeon?
Random encounters were originally put in to add spice to long travel and make it feel like actual long time to travel and dangerous. Nowadays with modern story telling you can continue using it if you want but if you have a story base campaign they mostly just interrupt the flow.
If you want to use them for Additional XP and gold from time to time to adjust your players level gently and/or because you havent quite prepped the next area and you want to stall til next week then go nuts but see them for what they are, a purposeful time filler and making your players scared to go throught the forest.
If you mean within a dungeon then go nuts if you arent planning your dungeon fight by fight and you like the challenge of your monsters being random so your players have a more even chance, go nuts.