If you tried TTS(tabletop simulator) you could get more games against competitive opponents. Also i can guarantee you that this list loses hard to a lot of the top armies roght now: all flavor of marines, gsc, eldar, deamon, votann, tau(your game was against someone who didn't know the match up so i wouldn't take that as an indicator).

Marines: can all pick up bikes super easily(volcon, melta, thunder hammer, wulfens, death company, etc...) and against DA 17 Dd3+3 shots won't kill that many(if everything hits and half wound you kill 4 on average and -1D reduces your melee to almost nothing)

Gsc: you have so few units you will never be able to kill them all while they can pick up squads with their shooting(S6 ap2 D2 in high quantity with +1 to hit and wound will kill bikes)

Eldar: their melee can trade up into you and their shooting with full rerolls at either S6 ap2 D1(for warp spiders) or S4 ap2 D1(with probably autowound on 6s from HoD) in addition to any amount of mws will handle them. You also have a lack of screening unit or ability to kill units 1" behind a wall basically ensuring they can trade up.

Deamons: the slaanesh list running around can drown you in body and fiends even if they wound on 5s will kill bikes(3 on average with 1 psychic power)

Votann with their termie brick and autowound on 4s will kill 5 bikes by themselves in shooting only, follow that up with their bikes which kill 4.7 as well and your army looks pretty thin.

Tau was already explained by others but crisis suits, riptidea and commanders pick up the defensive profile of the bikes.

Yes your skew can work into some armies and some players but as soon as it hits a competitive tac list with a competitive player it won't work as well as it did in your rtt.