have you used  a metronome?

have you tried counting a metronome into 8th notes and then its subdivisions?

most songs out there have steady beats, would say 99% of them are steady.

yea and how good are you at it, say can you count a beat as 1 + ,      , 3 + , 4 +

Waltz tends to have a diff timing 3/4, so it might fuck things up if you cant do standard 4/4

not really, at the end of it all, its still the metronome, but most people count metronome by basic 1 - 2 - 3 - 4 and then sub divide, that imho gets old very fast because you dont force yourself to build your own internal time. (we all have internal clocks). so folks can follow get bored and then think theres more to life than following a red dot

what i like is you skip the 1st or 2nd beat then hunt for it, so it goes -------- 3 - 4 - and your brain needs to find 1 and 2.

piano is a bit hard to get the counting right, because you have melodies that run around and its not very structured, in the sense that the note can start on 2 after a lengthy sustained note at the 4th beat.

try counting on easy music first, western pop/ house,trance (easiest) / rock, then from there move on to classical pieces, piano pop ( jay chou) and what not. one of my favourite tricks is to on a radio to some unknown station (i like mix) then just count the beat on the song when it comes up.

imo, just a bunch of mumbo jumbo.
if u can play somewhat in time without a metronome, that already means u can somewhat follow a beat.
the problem u probably face with a metronome is u are too aware of it, so u over-think and miss the beats.
as long as u can hear the piece in ur head along with the metronome, then there is no reason why it cannot be played short of lack of technical ability.

Go back to basic like humming+clapping or humming+finger tapping