The standard velcro power strap — that 30-35mm wide hook-and-loop strap at the top of your boot cuff — is perfectly fine for most recreational and intermediate skiers. It gives you adequate closure power to keep your lower leg snug against the boot cuff, and it's easy to adjust on the fly.
Where it falls short is long-term durability and maximum power transfer. Over time, velcro can stretch and lose some grip, especially if you're an aggressive skier really leaning into your boots. If you're mostly cruising groomers or skiing a few weeks a year, you likely won't notice.
If you're an advanced skier pushing hard or racing, you might benefit from a wider velcro strap (40mm+) or a mechanical buckle strap for more precise, powerful closure. But for the majority of skiers, the standard strap does the job just fine — just make sure you actually use it and keep it snug.