One of the most common mistakes with tubeless is not checking your tyre pressures often enough. Tyres deflate constantly, whether tubed or tubeless. With tubes the starting pressure tends to be higher which means that the ‘thumb gauge’ works better – feeling more pressure vs carcass stiffness. When the pressure gets too low with tubes you pinch flat and accept that’s what happens with tubes. With tubeless the starting pressure is lower and the thumb test inaccurate. Also tubeless often deflates faster between rides. Let the pressure get too low and they burp.
Some tyre/rim combinations are a pain in the neck. Ghetto tubeless with split BMX tubes works well but Stans rims are better. Those anchovies (sticky rubbery stringy things) are brilliant for sealing bigger slices that are too much for sealant alone. You can’t experience lower pressures with tubes unless you want to mince over anything rocky/pointy for fear of pinch flats. Larger volume tyres at lower pressures run tubeless roll as fast as skinnier tubed higher pressure ones and grip way better. The bigger the tyre, the lower the pressure that works, as long as the rim is wide enough. The stiffer the carcass, the less critical pressure is to prevent burps/rolling. Big but light tyres have about a 5psi window between too wobbly and too bouncy.
If you don’t care about riding faster/harder downhill or critical seconds uphill on XC races and/or never get punctures then you may as well stick with tubes.