When I used tubular I would always wear gloves. Before putting track on layout I would put a piece in each hand and push together and take apart several times. This made it much easier to assemble when placing the track on the platform for assembly. I still had minute gaps at some sections but that never hurt any wheels or tires. My smallest diameter was 054.
Good idea. I accepted some on my GG layout, but we really shouldn't accept any on a permanent layout. There is no reason for them except, ultimately, sloppy workmanship (guilty). This stuff is designed to fit, and it will.
On a temporary/display layout? Sure.
BTW, the "gaps" will not harm wheels. Traction tires? Maybe a little. Sometimes. Maybe. Only on really high-mileage - or abused ("I pulled 1000 cars!") - locos.