when u swing one leg over , the opposing arm takes all the weight of the bike and your momentum . With a little help from your opposing foot .. fine for a 20-30 lb bike ; not so great for a 60-80lb one . My first fall ( tho from a standstill ) was trying a swing over the seat , on an incline . soon as my right leg started to clear , the front tire turned left and then the whole bike went that way ... no pain for me but it broke the Aventon seat ...
a step over LOOKS more racy , and now I'm in better shape so I could do it . but why bother ? just for macho pride ? Bike's not going to go any faster , with either style . I'm also riding clipped in most of the time , so a second delay in getting that foot out ain't good either ..
BTW smaug found a better solution to a battery wrap around your water bottle , without punching holes in the neoprene .. get one with a zipper , instead .. Couple of different brands on Amazon , have them ..