Sure. But you need seasonings and other ingredients for meat dishes too. But with lentils there are many different varieties, as well as rice, and you can combine them in all kinds of different ways.
Technically, not really, all you need is fire.
Of course it tastes better with seasoning, but I've enjoyed just slapping a steak on the BBQ grill and eating it medium rare enjoying the internal juices.
But yes, once you start looking at different cooking methods, spices/seasonings, varieties..There's a lot of options for you.
It's similar for meat...many different cuts of steaks, strips, ground, fried, grilled, cubes, sauces, beef broth also used to make veggie meals, can even have it raw as a tartar.
That's just with beef, add in poultry, game, seafood...
Let's not pretend (not saying you are) meat is a narrow family of ingredients.