Many top players do this (not just on long safeties, but all shots), and they seem to master it well. I used to do this also, but when I switched to varying my stroke length with shot speed, still using similar smooth acceleration on every shot, my speed control got better immediately. For those who are interested, I cover this in more detail here:
You may have seen one of my 700 posts over the years about stroke technique and timing.
I find Short Stroke, Mid Stroke, and Long Stroke technique, combined with the proper length bridge, for each stroke, is difficult to beat, a recipe for success.
Many players posses only one technique. and they're missing out, especially long strokers.
It has cost a Hall Of Fame Player World Championships, because he lacks short stroke technique.
He couldn't control the mass of the cue with his long stroke for small movement.
He ended up short on the 50 yard line a few times, 2nd place.
Combine 3 stroke techniques, with stroke drills, and table length incriments of 3 and 4.
A player will develop beautiful timing, a very smooth stroke, Their speed control will increase dramatically in a shorter time.
The swing arm will naturally find the speed and timing for long and in between distance.
It becomes second nature, with very little thought.
Only a few stroke drills/shots are needed.
Stroke drills are not shot drills, the shots are automatically built in.
Not the shot drills in books I see players practicing for hours, and after 2-3 years have no game.
Breaking the table into 4 quadrants, 3 stroke techniques, and stroke drills is all it takes.
Once they know the quadrants, and stroke technique, they become more comfortable striking the cue ball, and speed happy.
When they are comfortable striking the cue ball with stroke and speed, its off to the races.
To repeat, It becomes second nature.
A player is born.
A monkey can learn, diamonds, kicks, stance, grips, bridges eyes,etc.
It's in all the books and is easily learned, easily. How much can a stroke and timing read?
Stroke technique and cue ball knowledge is the name of the game.
Timing comes along for the ride.
Best:SS