split ISP to two separate home routers

My router handles 50 items. I have 72 and counting. I thought I could split my 10Gb signal to two routers. Then use one for smart devices tv, phone, pc, tablets and one for dumb devices; light switches, bulbs, cameras, motion sensors etc. Each router would then have less than 50 devices to handle. Would that work better than one (tp-link ax11000) router with 70 plus devices. And what would the speeds be 5Gb each or 10Gb each?

Question by spencer james on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.