Yes, that is what I do. And use heritage tomatoes, & pepper bacon.
I think all these things improve the B.L.T.—so long as you do one more thing: Drop the T. Tomato slices on sandwiches are terrible. They add no flavor, their slipperiness destroys the physical integrity of a sandwich, and they introduce horrible textures (sliminess that interacts horribly with the seedy bits and the plasticky skin. Ugh!).
Only one thing can improve a BLT: Making it a BLAT. That is all.
The way I see it, if you’re not using a flavorful garden tomato, don’t even bother making a BLT.
Avocado adds nothing to anything except guacamole.
Mayo is required, and good mayo is the key to transcendence. That means Duke’s. Heirloom tomatoes or garden-grown, top quality bacon and sourdough bread nicely toasted. Pepper and maybe a little pepper flake or Pasta Sprinkle, as the mood strikes.
Exactly all that, except I don’t know anything about Pasta Sprinkle (shall Google.) Now that I’ve found Duke’s at my local grocery, it’s become my favorite, supplanting the Hellman’s I’ve used all my life. (Don’t get me wrong, I still enjoy Hellman’s/Best Foods.)
When tomato season comes, it’s BLT season. I bake my own Japanese milk bread for it, and try to use Neuske’s bacon or some hot smoked Polish bacon from the Polish deli. And the crunchy part of romaine for the lettuce. Iceberg is perfectly fine as well.
But I keep it B, L, and T as the main ingredients. No avocado, no chicken, no onion, none of that. And gentle on the bacon. This is primarily a tomato sandwich to me.
This. Drop the lettuce. It’s gross and makes everything taste like lettuce.
Bacon , lettuce, anchovies and tomato. I like the way you think.
How about a little mutton?
Wendy’s Jr Bacon cheeseburger is actually the BEST BLT ever made. The patty takes a back seat in this particular sandwich. Which makes it a contender for best BLT.
No egg. When one cannot eat eggs, the addition of an egg to anything, makes it inedible (unless it is well mixed in, and diluted by a number of other ingredients, as a cake). And North American diners and truck stops seem to insist that patrons eat eggs for breakfast: “Two eggs any style, plus…” The choices for those of us who cannot eat eggs on their own are severely limited–sometimes, pancakes or dry cereal are available. Ask them to remove the eggs from the regular dishes, and they will, but there is no reduction in the menu item’s price.
As one who cannot eat eggs, the BLT is my go-to in North American diners at breakfast-time. If they can do toast, have tomatoes and lettuce, and can fry bacon, I’ll have a nice breakfast. A lot of places don’t have a BLT on the menu for breakfast, but I’ve found that they can do one, if I ask.
Ditto. I don’t make BLTs until my garden tomatoes come in, and I stop making them when my garden tomatoes are over. Toast, Hellman’s, good bacon, my tomatoes, and red leaf lettuce make a perfect BLT. With some garden tomatoes on the side.
The only time I’ve had lettuce for breakfast was in Tokyo, where they were quite confused about Western breakfasts.
Now, bacon and egg on an English muffin with cheese is awesome. But not a BLT.
Add avocado, and have it fed to you by the hand-maidens of the wives of the enemies you have crushed under the heels of your ghrozny, vonny boots.
I call that a Kubrick Sandwich.
Agreed, what the Japanese do with breakfast is bordering on being a crime. Which is why I always eat breakfast at Dennys while I am there. They serve american style breakfast and you can get a beer and a shot with it if you desire.
Mayonnaise made from scratch improves a BLT.
It was improved upon long ago. It’s called, “The Turkey Club Sandwich”. 
False. I’m in full agreement with Kenji on this one:
A BLT is not a democracy. It is not a committee meeting. It is a dictatorship, and the tomato is King, Queen, and Supreme Leader. In the BLT universe, the Prime Directive is that all other ingredients shall be at Her Majesty’s service, their only role to prop her up and enhance her best qualities.
The mere existence of this thread is proof that most people today have never had a truly great tomato. I don’t even like raw tomatoes yet I can still remember the tomato sandwich I had in Greece on the island of Corfu back in 1991. I’ve never found anything like it in any store ever since. Some homegrown tomatoes have come within squinting distance but not very close in texture or flavor.
I agree with the tomato champions. A great tomato makes a great BLT, even if all the other ingredients are just okay (I don’t find much difference between expensive and cheap bacon in terms of BLT quality). A bad tomato might as well not even be there.