FR should have stuck to their process and should not have softened their controls on excessive and oversized cabin bags being size checked at the boarding gate. If it's too bulky or you're taking the p!ss by attempting to take on board large luggage or several pieces then all these items should be religiously tagged and dumped in the hold.
Clearly, some pax have extreme difficulties following the basic rules. Cabin aisles choked with punters clambering for overhead cabin bag space for their grandfather clock or whatever sh!he these clowns chance trying to get on board. Push backs get cocked up, slots missed, and all because some selfish idiots want to make sure they're alright, but sod the rest of the pax on board.
To be fair, I don't blame the airline for changing the carry on baggage rules, the actions of some pax have ruined it for everyone else. Though I expect FR personnel to get hard-core with any idiot at the boarding gate who can't stick to the basic and reasonable rules.