That's the bottom line. Both types have advantages and disadvantages.

I happen to like magazine disconnects, but, depending on what I am doing with the particular gun, can live with a pistol that doesn't have one - and sometimes prefer it that way. I certainly don't need one on a pistol used only for target shooting.

A lot of whether the mechanism serves you well or not mainly depends on what you use the gun for. In your OP, you don't say what pistol you are considering. The M&Ps, for example, I gather can be changed back and forth if you want, but of course a pistol not equipped with one when shipped will have the slide markings, which may or may not matter to you.