Various notes:

I have a hybrid bike with the tilting stem, it's nice, if heavy.

My 20" wheel folding bike has the flat handlebar centered on the stem, no reach, and the clamp is welded so no adjustment or replacement, however the long "handlepost" between the headset and handlebars, cants forward, so I actually do have a horizontal stem reach, it's just "hidden". I like this setup better than a bike friday which uses a straight handlepost directly from the steering tube, then a conventional stem to put the handlebars forward, however this means the long post is susceptible to being hit by my knees when climbing out of the saddle; When I hung a small bag on the back of my handlebars, I was hitting it constantly, so same would be true for a post more aft. However on a BF you can swap the stem, including for a suspension stem, which I would like.

Handlebar reach/height can be tricky combined with clip-on aero bars. On my old road bike, I replaced the drop bars with bullhorns at the same stem height, much more comfortable, and had clip-on bars with spaced-up forearm rests. My folding bike from above, has bar ends tilted up like bullhorns but on a much wider spacing, more comfy, and aero bars, but I have yet to acquire the 70mm spacers I desire for those, I want to be fully comfortable on the aeros, not aerodynamic tuck, in order to ride most of the time there to take pressure off my hands.