1) It's adjusted EBITDA which makes it even more meaningless.
> What is interest, if not an expense? What is tax, if not an expense? What is depreciation if not an expense? Alright, amortization, yeah, that one could get added back in – I buy that.
2) There is a specific reason these get taken out, because they generally represent values that the company either has little control over (taxes) or represent episodic expenditures (capital purchases, or debt raises) that have meaningful life greater than 1 year. D/A are essentially synonymous. So, no, D/A are not expenses, because they are simply representations of capital expenditures shown as expenses (the distinction is important) throughout the useful life the asset (intangible or tangible).
Easy way to illustrate this is an airline who buys an airplane in year 1 and then uses that plane for 30 years. If EBITDA wasn't useful, then calculating their earnings over a period time won't tell you anything about trends of the business health.
The devil is in the details. EBITDA is not all that bad, it's just not a "one figure to rule them all", especially since most firms create an "Adjusted" version of it to fit some narrative (and they always do).
To your point. The cashflow statement is much more important IMHO.