I'm new to biking only doing it since the past 3 months. I don't use my front gears much since i'm pretty tall and lower gears means going at a very high cadence for little output. so wondering if i could remove the derailleur. Does this create any problem?
I would fix the derailleur on the gear you prefer (perhaps middle one, to get most of rear gear properly working) as the derailleur don't interfere to leg movement. Take in mind that in few months you can change your mind and start using front gears too.
As others have said, sure, it can be removed, but let's look at the pros and cons.
You could reduce weight even more by simply losing a few grams of weight yourself. So unless you live in a place with no significant hills and never plan to sell the bike, it makes no sense to remove it. Just put it on the big chainring and leave it there. The presence of a derailleur costs you nothing.