I can only confirm!
Had about 800h in XCOM2 + WOTC. Could I find strong strategies? YES … did I break the game? Absolutely NOT. Rather, I only tried the (I think) fifth play through to the “Legend” level. It was damn hard, because there were NO absolutely dominant tactics.
In PP: I started writing here after 30 hours.
After the first playthrough, all exploits were known to me, except for the invulnerability (stackable electric reinforcement)