Locking Tuners

I have a hardtail bridge guitar. The tuners already on there do a decent job of keeping the guitar in tune. Would it be worth putting locking tuners on there for the amount they would keep the guitar in tune better? Also I've heard the more winds of string you have around the post, the more sustain you are losing. Is that true, and if so is it even a noticeable difference?

Don't fix it if it ain't broke.

Ya really don't need lockers on non-trem guitars - they're only advantage there, if any, is speed of string changing.

Too many winds on the tuner may not make any difference in sustain, but it can aid in tuning instability. Some strings will actually stretch along their length and around the post. Personally I find two to three winds works for the plain strings and one to two winds works best on the wound strings.

The other consideration in using several winds is to help eliminate plain string buzz in the absence of a string tree. By wrapping the string several times around the post and making sure the each wrap goes "below" the previous one, the string gets pushed lower on the post which increases "break-over" angle at the nut and, back in the day, helped to eliminate string buzz.

I have a hardtail bridge guitar. The tuners already on there do a decent job of keeping the guitar in tune. Would it be worth putting locking tuners on there for the amount they would keep the guitar in tune better? Also I've heard the more winds of string you have around the post, the more sustain you are losing. Is that true, and if so is it even a noticeable difference?

I think you may want to look into the nut. I changed on my hardtail strat to locking tuners and graphtech saddles and nut. It made a huge difference.
Almost no more string breaks, tuning is much more stable and I can change strings very quickly now.
It depends on how you play and bend, but in my opinion the nut is what really makes a difference in regards to staying in tune.